At the boss stage of Phogoth Titan's and Warlocks are able to jump from the platform at the cliff to the Rocks on the left under the usual map. This player won't get damage but gets aggro.
Easy to play off Phogoth with a 3 Person lvl 9 grp and this tactic.
I hope it'll be fixed soon.
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sry for this bad english, it's not my native language.