Cory

the engineer is found in the far northwestern part of The Village and north of the Beekeeper. During the day, he is outside and sells stones and stone products to you. At night he goes inside and is unavailable without 80.

Quests
Cory and Tress need to help you build your Tavern after buying the land from Horadric for. Speaking to Corey he will tell you they need to build a barn first. You can choose to either pay him or supply him the materials (12, 12 , 12  and ) to finish working on the barn and get to building your Tavern. Go to sleep to let the brothers finish the Tavern for you. You'll receive the Talking Skull achievement.