The Twelfth Colossus is the twelfth enemy fought by Wander in Shadow of the Colossus. Like the game's other Colossi, it is a large golem that appears to be at least partially constructed from stone. Its appearance is somewhat alien when compared to the other Colossi; its general shape loosely resembles a turtle with a large shell, but it has the stance of a gorilla with its two shorter rear legs and elongated forelimbs. The head bears a pair of bull-like horns with no eyes, and it moves like a hippopotamus by walking along the bottom of a body of water while keeping its head above the surface. This Colossus can be found in a flooded basin that flows into a waterfall located north-by-northeast from the Shrine of Worship.
This battle begins once Wander climbs onto one of the basin's sunken ruins, triggering the Twelfth Colossus' emergence from the bottom of the basin. Its primary attacks are energy bolts fired from its horns; these can be avoided by taking cover behind the ruins or under the water's surface. The first objective is to climb onto the creature's head by luring it towards one of the taller ruins; from there, Wander either can circle around to climb the Colossus' moss-covered back, or attempt to jump directly onto its mask-like face from the edge of the ruin.
The Twelfth Colossus also features several bony protrusions resembling teeth lined around the top of its head. Once its head is reached, striking one of these "teeth" with a weapon will force the creature to move in the corresponding direction, allowing players to steer the Colossus towards the one of the taller ruins. After jumping from the creature's head onto the roof of the structure, Wander can then provoke the Colossus into rearing up out of the water and exposing the weak point on its moss-covered belly. However, the Colossus will re-submerge after being stabbed twice, destroying one of the tall ruins and forcing players to repeat the process at a different location.