Question: Velks Lab

[Izmael]

Likely the dispell trap..

If you're a rogue though, make sure to /con mobs for see invis when they are facing you. If you're sneak/hiding, they might see invis but still /con indifferent since you're sneaking behind. Then you (or them) turn and wham, they aggro since sneak doesn't change faction to indif any longer.