Roboute Guilliman

[Nevarh]

Hi there!

We had a fight with the Monster Roboute Guilliman entering the fight as wandering Monster.

Another player played a monster enhancer that gives a bonus and makes the monster a (specified kind of) monster.

The text of R. says he can not be part of a fight when there is a (specified type of monster) in it.

Question is, (1) can this enhancer (not) be played on this monster? (2) Can it be played but R leaves the combat immediately?
(3) Can it be played and that part of the monster description must be ignored because he is now a (specified type of monster)?

Thank you for your help!