Exhibit (k)(4)

AMENDMENT AGREEMENT NO. 3 TO AMENDED AND RESTATED CREDIT AGREEMENT

This AMENDMENT AGREEMENT NO. 3 TO AMENDED AND RESTATED CREDIT AGREEMENT (this "Amendment") is made as of December 9, 2013, by and among BLACKROCK DEBT STRATEGIES FUND, INC., a Maryland corporation (the "Borrower"), the lending institutions listed on the signature pages hereof (collectively, the "Banks") and STATE STREET BANK AND TRUST COMPANY, as agent for itself and such other Banks (in such capacity, the "Agent");

WHEREAS, the Borrower, the Banks and the Agent are parties to that certain Amended and Restated Credit Agreement, dated as of March 3, 2011 (as amended and in effect from time to time, the "Credit Agreement"); and

WHEREAS, the Borrower has informed the Agent and the Banks that the Borrower wishes to effect a reorganization pursuant to which each of (a) BlackRock Senior High Income Fund, Inc., a Maryland corporation ("ARK") will, pursuant to the Agreement and Plan of Reorganization dated as of December 4, 2013, by and between ARK and the Borrower and in substantially the form attached hereto as Exhibit B-1 (the "ARK Merger Agreement"); and (b) BlackRock Strategic Bond Trust, a Delaware statutory trust ("BHD") will, pursuant to the Agreement and Plan of Reorganization dated as of December 4, 2013, by and between BHD and the Borrower and in substantially the form attached hereto as Exhibit B-2 (the "BHD Merger Agreement" and, collectively with the ARK Merger Agreement, the "Merger Agreements"),merge with and into the Borrower (the "Mergers" and each, a "Merger"), with the Borrower being the surviving entity of each Merger and in connection with each such Merger, assuming all of the assets and liabilities of each of ARK and BHD, and the stockholders of each of ARK and BHD will, pursuant to the terms of the applicable Merger Agreement, become stockholders of the Borrower; and

WHEREAS, in connection with such reorganization (the "Proposed Transaction"), the Borrower is requesting that the Agent and the Banks agree to amend certain provisions of the Credit Agreement; and

WHEREAS, the parties hereto wish to amend the Credit Agreement and make certain other agreements with respect to the Proposed Transaction as more fully set forth herein;

NOW, THEREFORE, in consideration of these premises and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows:

§1.           Definitions.  Capitalized terms which are used herein without definition and which are defined in the Credit Agreement shall have the same meanings herein as in the Credit Agreement.

§2.           Amendments to Credit Agreement.

(a)           Section 1.01 of the Credit Agreement is hereby amended by deleting the definitions of "Account", "Aggregate Commitment Amount", "Custodian", "Custody Agreement" and "Prospectus" in their entirety and restating each such definition as follows:

"Account" means the accounts that the applicable Custodian has opened and maintains for the Borrower pursuant to the terms and conditions of the applicable Custody Agreement, provided, that for period commencing immediately upon the consummation of each 2013 Merger in accordance with the terms of the applicable 2013 Merger Agreement until the transfer of the assets in each of the ARK Account and the BHD Account into the Account, the term "Account" shall be deemed to also include each of the ARK Account and the BHD Account for all purposes of this Agreement, including, without limitation, compliance with Section 4.17 hereof.

"Aggregate Commitment Amounts" means, as of any date, the aggregate of all Commitment Amounts as of such date.  On the Second Amendment Effective Date, the Aggregate Commitment Amount is $231,000,000 and from and after the Third Amendment Effective Date, the Aggregate Commitment Amount is increased to $405,000,000.

"Custodian" means (a) prior to the Third Amendment Effective Date, The Bank of New York Mellon; and (b) from and after the Third Amendment Effective Date, (i) State Street Bank and Trust Company and, (ii) until the Custodian Termination Date, The Bank of New York Mellon.

"Custody Agreement" means (a) prior to the Third Amendment Effective Date, that certain Custodian Agreement, dated as of October 26, 2001, among the Borrower, the other investment companies party thereto and The Bank of New York Mellon, as the same may be amended, supplemented or otherwise modified from time to time (the "BONY Custody Agreement"); and (b) from and after the Third Amendment Effective Date, (i) that certain Master Custody Agreement, dated as of September 21, 2001, among the Borrower, the other investment companies party thereto and State Street Bank and Trust Company, as the same may be amended, supplemented or otherwise modified from time to time and, (ii) until the Custodian Termination Date, the BONY Custody Agreement.

"Prospectus" means the Joint Proxy Statement/Prospectus dated September 9, 2013 and filed with the SEC on September 10, 2013 pursuant to Rule 497 under the Securities Act and shall include, without limitation, the Statement of Additional Information included in the related registration statement on Form N-14 as amended (or any successor SEC form) as of December 9, 2013.

(b)           Section 1.01 of the Credit Agreement is further amended by inserting the following definitions in the appropriate alphabetical order:

"2013 Merger" means, collectively, the mergers, to be effective on December 9, 2013, of (a) ARK into the Borrower pursuant to the ARK Merger Agreement and (b) BHD into the Borrower pursuant to the BHD Merger Agreement, in each case with the Borrower being the surviving entity.

"ARK" means BlackRock Senior High Income Fund, Inc., a Maryland corporation.

"ARK Account" means the account that the Custodian has opened and maintains for ARK pursuant to the terms and conditions of the Custody Agreement.

"ARK Merger Agreement" means the Agreement and Plan of Reorganization dated as of December 4, 2013, by and between ARK and the Borrower, substantially in the form attached as Exhibit B-1 to the Third Amendment, pursuant to which, among other things, ARK merges with and into the Borrower, with the Borrower being the survivor thereof and assumes all of the assets and liabilities of ARK.

"BHD" means BlackRock Strategic Bond Trust, a Delaware statutory trust.

"BHD Account" means the account that the Custodian has opened and maintains for BHD pursuant to the terms and conditions of the Custody Agreement.

"BHD Merger Agreement" means the Agreement and Plan of Reorganization dated as of December 4, 2013, by and between BHD and the Borrower, substantially in the form attached as Exhibit B-2 to the Third Amendment, pursuant to which, among other things, BHD merges with and into the Borrower, with the Borrower being the survivor thereof and assumes all of the assets and liabilities of BHD.

"Custodian Termination Date" means the date occurring after the Third Amendment Date when the BONY Custody Agreement has been terminated, and The Bank of New York Mellon ceases to be a Custodian.

"Merger Agreements" mean, collectively, the ARK Merger Agreement and the BHD Merger Agreement.

"Third Amendment" means that certain Amendment Agreement No. 3 to Amended and Restated Credit Agreement dated as of December 9, 2013 by and among the Borrower, the Banks listed on the signature pages thereof and the Agent.

"Third Amendment Effective Date" means the later of (a) the "Document Effective Date" as defined in the Third Amendment and (b) the date on which the 2013 Merger has been consummated pursuant to the terms of the Merger Agreements.

(c)           Section 5.04(c) of the Credit Agreement is hereby amended by deleting Section 5.04(c) in its entirety and restating it as follows:

(c)           Other than as expressly permitted by the Agreement and the Security Agreement, the Borrower will at all times place and maintain its assets in the custody of the Custodian, and from and after the Third Amendment Effective Date, in connection with the Borrower's decision to change its custodian from The Bank of New York Mellon to State Street Bank and Trust Company, the Borrower will take all reasonable action to place, maintain and have most of its assets in the custody of State Street Bank and Trust Company as Custodian.  In addition, the Borrower shall notify the Agent of the occurrence of the Custodian Termination Date promptly upon the occurrence thereof.

(d)           Schedule 1 to the Credit Agreement is hereby amended by deleting Schedule 1 in its entirety effective on the Third Amendment Effective Date and, on such Third Amendment Effective Date, substituting in place thereof the Schedule 1 attached hereto as Exhibit A.

§3.           Representations and Warranties.  The Borrower hereby represents and warrants as follows:

(a)           Representations and Warranties in Credit Agreement.  The representations and warranties of the Borrower contained in the Credit Agreement (as amended by this Amendment) are true and correct on and as of the date hereof and with the same force and effect as it made on and as of such date (or, if any such representation or warranty is expressly stated to have been made as of a specific date, as of such specific date).

(b)           No Default.  No Default or Event of Default has occurred and is continuing.

(c)           Authority, Etc.  The execution and delivery by the Borrower of this Amendment and the Borrower's performance of this Amendment and the Credit Agreement as amended hereby (as so amended, the "Amended Agreement") (i) are within the Borrower's corporate powers, (ii) have been duly authorized by all necessary corporate action on the part of the Borrower, (iii) require no Governmental Authorizations, Private Authorizations or Governmental Filings by the Borrower which have not already been obtained or made, (iv) do not contravene, or constitute a default under, any provision of (A) any Applicable Law unless the violation of such Applicable Law could not reasonably be expected to have a Material Adverse Effect, (B) the Charter Documents of the Borrower, or (C) any agreement, judgment, injunction, order, decree or other instrument binding upon the Borrower unless such contravention or violation could not reasonably be expected to have a Material Adverse Effect, and (v) do not result in the creation or imposition of any Lien on any asset of the Borrower (other than Liens in favor of the Agent to secure the Obligations and Liens permitted pursuant to Section 5.08 of the Credit Agreement).

(d)           Enforceability of Obligations.  This Amendment has been duly executed and delivered by the Borrower.  Each of this Amendment and the Amended Agreement constitutes the valid and legally binding agreement of the Borrower, in each case enforceable in accordance with their terms, subject to applicable bankruptcy, insolvency, reorganization, moratorium or

other similar laws affecting creditors' rights generally and general principles of equity (regardless of whether enforcement is sought in equity or at law).

§4.           Effectiveness.  This Amendment shall become effective on the date that each of the following conditions shall have been satisfied or waived in writing by the Agent (such date being the "Document Effective Date"):

(a)           counterparts of this Amendment duly executed and delivered by each of the Borrower, the Banks and the Agent;

(b)           counterparts of each Notices of Termination attached hereto as Exhibit C duly executed and delivered by each of ARK and BHD notifying State Street Bank and Trust Company in its capacity as agent under the Other Agreements (as hereinafter defined) of the intent to terminate its respective credit facilities under those certain Amended and Restated Credit Agreements, each dated as of March 3, 2011 by and among each of ARK and BHD, as applicable, the lenders party thereto and State Street Bank and Trust Company, as agent for such lenders (each, an "Other Agreement"), immediately upon the occurrence of the Merger;

(c)           a certificate duly executed by an officer of the Borrower which is reasonably satisfactory to the Agent certifying that (i) the representations and warranties of the Borrower contained in the Credit Agreement (as amended by this Amendment) and the other Loan Documents shall be true on and as of the Document Effective Date and with the same force and effect as if made on and as of such date (or, if any such representation or warranty is expressly stated to have been made as of a specific date, as of such specific date), (ii) the Borrower will remain a closed-end management investment company (as such term is defined in the Investment Company Act) and will remain registered under the Investment Company Act after giving effect to the Proposed Transaction; (iii) no Default or Event of Default has occurred and is continuing or will result from the Proposed Transaction; and (iv) the Agent's security interest in the Collateral will remain perfected upon the consummation of the Proposed Transaction;

(d)           a duly executed certificate from the Secretary or Assistant Secretary of the Borrower in form and substance reasonably satisfactory to the Agent and dated as of the Document Effective Date certifying and attaching copies of (i) the Borrower's Charter Documents, with all amendments thereto (other than the Merger Agreements) (or a certification that the Charter Documents previously delivered and certified to the Agent pursuant to Section 3.01(f) of the Credit Agreement have not been amended, supplemented or modified (other than by the Merger Agreements) and are in full force and effect); (ii) an excerpt from the Minutes of Joint Regular Meeting of the Board of Directors/Trustees of the BlackRock Closed-End Funds dated July 19, 2013 approving the Proposed Transaction, the Borrower's entry into this Amendment and the transactions described herein; (iii) the current Prospectus as then in effect (or a certification that the Prospectus previously delivered and certified to the Agent has not been amended, supplemented or modified and is in full force and effect); (iv) the investment management agreement between the Borrower and the Investment Adviser as then in effect (or a certification that the investment management agreement previously delivered and certified to the Agent has not been amended, supplemented or modified and is in full force and effect); (v) the Custody Agreement (or a certification that the Custody Agreement previously delivered and certified to the Agent has not been amended, supplemented or modified and is in full force

and effect) and (iv) copies of the duly executed Merger Agreements to be attached to this Amendment as Exhibits B-1 through B-2, as contemplated herein;

(e)           a legal existence and good standing certificate for the Borrower from the Secretary of State of the State of Maryland dated as of December 6, 2013;

(f)           a copy of the certificate of incorporation of the Borrower, with all amendments, certified as of a recent date (which will be prior to the date of the Merger) by the Secretary of State of the State of Maryland; and

(g)           a legal opinion of each of (i) Skadden, Arps, Slate, Meagher & Flom LLP and (ii) special Maryland counsel to the Borrower reasonably acceptable to the Agent, each in form and substance reasonably satisfactory to the Agent (and the Borrower hereby requests such counsel to deliver such opinions).

§5.           Conditions Subsequent.  The Borrower shall deliver to the Agent, by not later than the dates specified in each clause below, the following:

(a)           as soon as practicable after the consummation of the Proposed Transaction, but in any event by not later than December 10, 2013, copies certified by the Secretary of State of the State of Maryland of each Merger Agreement;

(b)           by not later than December 17, 2013, a duly executed updated Form FR U-1; and

(c)           by not later than January 10, 2014, counterparts of an amendment to the Security Agreement, which amendment shall, among other things, add State Street Bank and Trust Company in its capacity as Custodian as a party thereto and include provisions with respect to perfection of the security interest in certain Collateral by control, duly executed and delivered by each of the Borrower, the Agent and State Street Bank and Trust Company in its capacity as Custodian.

Any failure of the Borrower to deliver any of the items specified in this Section 5 by the applicable dates provided for herein shall constitute an immediate Event of Default under the Credit Agreement.

§6.           Ratification of the Borrower.  The Borrower ratifies and confirms in all respects all of its obligations to the Agents and the Banks under the Credit Agreement and the other Loan Documents and hereby affirms its absolute and unconditional promise to pay to the Banks and the Agents the Loans made to it and all other amounts due from it under the Credit Agreement as amended hereby.  The Credit Agreement and this Amendment shall be read and construed as a single agreement.  All references in the Credit Agreement or any related agreement or instrument to the Credit Agreement shall hereafter refer to the Credit Agreement as amended hereby.

§7.           Miscellaneous.  This Amendment shall be a Loan Document for all purposes under the Credit Agreement.  This Amendment shall be governed by and construed in accordance with the laws of the State of New York.  Except as specifically amended by this Amendment, the Credit Agreement and all other agreements and instruments executed and

delivered in connection with the Credit Agreement, including, without limitation, the other Loan Documents, shall remain in full force and effect.  This Amendment is limited specifically to the matters set forth herein and does not constitute directly or by implication an amendment or waiver of any other provision of the Credit Agreement or any of the other Loan Documents.  Nothing contained herein shall constitute a waiver of, impair or otherwise affect any Obligations, any other obligation of the Borrower or any rights of the Agents and the Banks consequent thereon.  This Amendment may be executed in several counterparts and by each party on a separate counterpart, each of which when so executed and delivered shall be an original, and all of which together shall constitute one instrument.  Delivery of an executed signature page to this Amendment by facsimile transmission or other electronic transmission shall be as effective as delivery of a manually signed counterpart of this Amendment; provided, the Borrower does agree to provide the Agent with an original manually signed counterpart of this Amendment within ten (10) Business Days of the Document Effective Date.  In proving this Amendment it shall not be necessary to produce or account for more than one such counterpart signed by the party against whom enforcement is sought.

[Signature page follows.]

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their respective authorized officers as of the date first above written.

BLACKROCK DEBT STRATEGIES FUND, INC.
By:	/s/ Neal Andrews
Name:	Neal Andrews
Title:	CFO
STATE STREET BANK AND TRUST COMPANY, Individually and as Agent
By:
Title:

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their respective authorized officers as of the date first above written.

BLACKROCK DEBT STRATEGIES FUND, INC.
By:
Name:
Title:
STATE STREET BANK AND TRUST COMPANY, Individually and as Agent
By:	/s/Karen G. Gall
Title:	Vice President

Exhibit A

Schedule 1

BORROWER:

BLACKROCK DEBT STRATEGIES FUND, INC.

100 Bellevue Parkway

Wilmington, DE 19809

BANKS:	COMMITMENT AMOUNT	COMMITMENT PERCENTAGE
STATE STREET BANK AND TRUST COMPANY	$405,000,000	100%
Domestic Lending Office: Mutual Fund Lending Department Copley Place, Tower 2 Boston, MA 02206 Attn.     Robyn A. Shepard, Assistant Vice President - CSU Manager Tel:         (617) 662-8575 Fax:         (617) 988-6677 Email: rashepard@statestreet.com LIBOR Lending Office: Mutual Fund Lending Department Copley Place, Tower 2 Boston, MA 02206 Attn:     Robyn A. Shepard, Assistant Vice President - CSU Manager Tel:         (617) 662-8575 Fax:         (617) 988-6677 Email: rashepard@statestreet.com For non-funding or payment notices: Mutual Fund Lending Department Copley Place Tower 2 Boston, MA 02206 Attn:     Karen Gallagher, Vice President Tel:  (617) 662-8626 Fax:  (617) 988-9535