Doing the Quests
He will ask you for 1-3 spooky food(s) and at a time limit of 2-3 hours. His request can be pricy and may not be worth the task. If you asked the Brain Tree for a quest first, the Escophagor's quest are vital to finding the answers for the tree's quest. You would need to completed two of the Escophagor's quests to find both answers of the Brain Tree's.
As a prize, you will get the Escophagor as a Battledome challenger (the first time you complete a quest) and a random item that are Rarity 89 and below.