"Othello"

To combat illusionists and enemies in disguise against Stable-49,scientists spliced the DNA of a volunteer unicorn with a changeling's DNA and small parts of an alicorn's DNA, thus creating "Othello", an experiment subject with the ability to cast illusion reversal spells and identify shapeshifters and disguised creatures.

He is fairly tame and can simply be contained in a regular cell. He may need to be separated from shapeshifters and illusionists. Don't look directly into his eyes. Is deathly afraid of loud noises and can be restrained by using an alarm.