Invasion point bug Pit Lord Vilemus

so i am farming a head piece for a full set for plate armor my main a lvl 70 had no trouble with the boss item didn’t drop so i went on my other toon a lvl 60 doesn’t do much damage but slowly can down it however a bug i noticed when fighting the pit lord is that my health bar full but got one shot when i was about to down the boss i had a fellow play watch me fight the boss again and they see what im seeing is that my health bar is fine and full but on the boss my health bar is not hes doing damage on me like im losing health so i had a fellow player down the boss and switch to my pally a lvl 51 where fighting the boss not losing health on my character and yet the boss is doing damage on its side of combat even healing myself doesn’t help prevent from being one shot by the boss will that problem be fix id like to get the helm needed to finish my set
this is in a greater invasion point too on a limit time this week

Not a bug, a mechanic.

Every time the victim is damaged in this way, they lose 10% of their maximum health for 20 sec.

It’s a tank-swap mechanic: you take 10 hits from that attack and your maximum health is reduced by 100%, which means you’re down to just 1 health. And then you take a minor hit and die.

The answer, as you figured out, is to kill the boss before that stacks up very high. And the only safe way is to do this on a 70.

No its definitely a bug had a player say the same thing when watching me fight it solo it never done any of that when i was soloing ive even come close to down it when suddenly i got ine shot ive even looked at the recap and it wasnt doing that much damage to me or did the Drain buff you mentioned