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Illusionist is a [[Boss Modifier]] found on Champions and Bosses in Diablo III.

Monsters with this property will create numerous duplicates of themselves periodically, all but filling the screen with multiple identical enemies. The copies look and act just like the original, but their attacks do not deal damage. While technically they are harmless, and have very low hit points so can be killed quickly, especially by AoE attacks, they are very distracting visually.

The Illusionist property works very much like the Wizard's [[Mirror Image]] skill, with multiple copies creating visual havoc, but not doing any actual damage.