It’s the new AOE from the Risen Noble Shadowstep skill. It creates a template that ticks for 900-1000 damage every second and completely destroys the NPCs that you are supposed to escort.
It was a bit ill thought out considering how many Risen Nobles are in this part of the chain.
This is happening pretty constantly with Claw of Jormag events, huge bouts of lag and frequent disconnections. Many people have said so on chat.
Even through normal play I have noticed that this area is a lot more laggy and unresponsive than others.
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