Cryskull

Cryskull is a Gaust found in Gaust Shot. Cryskull is an ancient artifact, the Crystal Skull, which is inhabited by many restless spirits. With his terrible power, he is able to make rumors reality, and the true extent of his power is largely unknown. It is said he lays resting in the Incan Temples of the ancient past. His ultimate move is Secret Ritual, which creates a bizzare space in which anything could happen...

Gaust Shot
Cryskull is the final battle of Symmetras' Memory Story. After Symmetras fails to achieve his dream of being split, he becomes somewhat desperate, and he begins hearing whispers that are calling him. Arriving at the Incan Ruins of Kalasasaya, Symmetras sees a sealed box, and hears the voice telling him to please set him free, and he will have whatever he desires.

In a moment of weakness, Symmetras opens the box and Cryskull is released, and it's power immediately causes the temple to raise into the sky and a powerful rainstorm whips up! Symmetras, horrified by what he has done, fights against Cryskull and his tremendous power, and finds that his split personality makes him harder for Cryskull to influence. He defeats the skull and seals him away, finally coming to terms with who he is.