they are there for a reason. You aren't supposed to cheese omnigul like that. Have you ever played that weakening mission? Well, at the end if you try to go behind the hill a shielded knight with crazy health will spawn. Valus Ta'aruc strike? Yup, in the entrance room a tough centurion spawns. Pretty much every strike has some sort of anti cheese enemy. (even though it may not be super affective)
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Don't forget the axis Minotaur on nexus strike
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You don't kill Omnigul in this mission there is no cheese whatsoever
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It's a sort of cheese because you are attempting to stay out of the battlefield. A "cheese" means more than taking out a boss easily