Damien gave Ace a meaningful look, and he couldn't refute Ace's words. Just as Ace said, despite Ace backing down, Damien won't trust him so easily. In fact, it would have been strange if Ace had done that, and now that he had proposed this plan, Damien was happy to comply.
After all, Damien wasn't here for the cultivation technique or the mystic abilities; he wanted the item. If Ace wasn't here, he wouldn't mind taking them, but since that wasn't the case now, and Damien was afraid of alerting the Wealth King, he conceded to Ace's demand.
Moreover, if he could win the loyalty of a Heaven Chosen like Ace by just giving up those two items that were useless to him, it would all be worth it. Not to mention, Damien still needs to get out of the PHW King Sect before the Wealth King notices this, and he knows she will notice it very quickly after he took the item. He had already made arrangements, so all that was left was to achieve his objective.
