At the time hereafter that any Subsidiary of the Borrower is created or acquired, Borrower will (a) promptly take all action necessary to comply with Section 5.15, (b) promptly take all such action and execute and deliver, or cause to be executed and delivered, to the Administrative Agent all such opinions, documents, instruments, agreements, and certificates similar to those described in Section 4.01(b) and Section 4.01(d) that the Administrative Agent or the Majority Lenders may reasonably request, and (c) promptly cause such Subsidiary to (i) become a party to this Agreement and Guarantee the Obligations by executing and delivering to the Administrative Agent a Counterpart Agreement in the form of Exhibit C , (ii) to the extent required to comply with Section 5.10, execute and deliver Mortgages and other Security Documents creating first priority Liens in favor of the Administrative Agent, subject in priority only to Permitted Prior Liens, in such Subsidiary’s Oil and Gas Property and substantially all of such Subsidiary’s personal property, and (iii) to the extent required to comply with Section 5.11, all title opinions and other information. Upon delivery of any such Counterpart Agreement to the Administrative Agent, notice of which is hereby waived by each Credit Party, such Subsidiary shall be a Guarantor and shall be as fully a party hereto as if such Subsidiary were an original signatory hereto. Each Credit Party expressly agrees that its obligations arising hereunder shall not be affected or diminished by the addition or release of any other Credit Party hereunder. This Agreement shall be fully effective as to any Credit Party that is or becomes a party hereto regardless of whether any other Person becomes or fails to become or ceases to be a Credit Party hereunder. With respect to each such Subsidiary, the Borrower shall promptly send to the Administrative Agent written notice setting forth with respect to such Person the date on which such Person became a Subsidiary of the Borrower, and supplement the data required to be set forth in the Schedules to this Agreement as a result of the acquisition or creation of such Subsidiary; provided that such supplemental data must be reasonably acceptable to the Majority Lenders.