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.
- 6 Vertebrae
- 6 Souls of Night
- 5 Iron/Lead Bars
- 4 Tissue Samples
- Mythril/Orichalcum Anvil
Credit for this idea goes to zoomo.
His profile can be viewed here: http://www.terrariaonline.com/members/zoomo.71392/