Crosia at the Taloc Research Campsite said the researchers wouldn't accept his help with the Holy Tree Taloc, and asked you to speak to Dorsia, the leader of the researchers. Dorsia said many Daevas have gone to help Taloc, but none could handle the excessive Aether energy and returned in vain. When you entered Taloc with the help of Lothas and ate a Taloc Fruit, you were suddenly able to wield a great power. With that power, you vanquished the being that was leeching off the Aion fragment embedded inside Taloc. When you filled Crosia in on this, he said he'll report everything back to the brigade general in the fortress.