The Abomination Within The Consciousness.

Soverick's eye turned pink completely. He was frozen in his action of gripping her neck. The entire pink domain entered his body and dug into his consciousness seeking to control it. It made her even more happy.

A domain of a transcendent is an area under their control. They can use their domain for numerous things but the only way it can affect another transcendent so seriously is if it is enforced by a law. In the case of this lady, she has managed to comprehend the equivalent of the law of illusion in this world fragment and she is trying to use it to gain control of Soverick.