Although it wasn't much, but it was enough to give him some lead which was better than anything he had found so far. Secondly, it was to repay the help he had rendered to him, while he might be cynical and cold, he knew when to repay a favor.
Information on the specifics of the pact and what he needed to do to fulfill it entered his mind, it was quite simple with everything already being self-explanatory, and Ainz nodded his head.
It was needless to say, besides those two reasons why he had declined to absorb the will of Ogun, was because he didn't show any intention of harming him, otherwise, even without the system telling him he would have wreaked havoc in the dimension.