The Mechanical Brain is used to summon the Mother Board boss. It can be crafted or can be found rarely in Shadow Chests. The boss can only be successfully summoned at night while in a Crimson cavern; if the brain is used during the day nothing will happen and it will not be consumed.
Crafting[]
- 6 Vertebrae
- 6 Souls of Night
- 5 Iron/Lead Bars
- 4 Tissue Samples
Crafted at:
- Mythril/Orichalcum Anvil
Credit[]
Credit for this idea goes to zoomo.
His profile can be viewed here: http://www.terrariaonline.com/members/zoomo.71392/