Crown of Thorns CAN Kill you

Was messing with wondertrap shoes trying to see how good rarity is in act 1 on my lvl 30 Minion Merc spamming fusilage to get my hp low with lifetap.

Fisilage stopped casting but when i used flame wall the helmet took me out.

Bummer to say bye to my HC friends i was playing with but I guess i learned something

Anything that gear says it does should be read in the literal sense. There's not much "magic" when it comes to modifiers, it does what it says it does - and there's no safeguards in place to stop you from killing yourself if you choose to do so.