Altar of Sartek/1.03

Minotaur
Another research focused building, but this one also produces the Minotaurs' Titan - the Skull of Sartek. Because of this, you need to place the building carefully with a lot of room around it so the Skull of Sartek when get stuck in your base after it pops out. Also, be sure to obtain all the researches out of the building before starting the production of the Titan, otherwise you'll either need to wait a long time before you can eventually get a hold of them, or build another Alter of Sartek, which is not advised as you'll need all the building room you can get come tier 4.