Had something similiar in the VoG yesterday, when you defend the pillar there are special Minotaurs coming from the portals. One of them didn't die and was constantly regenerating it's energy....
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Strange... It's only been harpies with me but according to you and dragonrebel it's been other enemies as well.
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We had one guy with us who ran the raid countless times and he was like "oh, that bug again...." So, it seems to happen quite often...