There's an issue with Aquareth boss (both normal and elite). Sometimes when the boss is killed a player gets massive DoT that kills in few ticks.

I know at least 3 hardcore players died because of this. Some people say it happens if the boss gets killed too fast e.g. from kraken procs and that correlates with incidents I am aware of.

Please take a look as the new season is coming and more players can suffer.