Time to go on a rant. It is obviously Deathmark. It goes through tenacity up can cause the toon to take half their health in additional damage whenever they take damage. There is a reason only 1 toon in the game has it only after another toon has been killed. Could you imagine TFP with death mark instead of Buff immunity? Some of these debuffs being listed come in groups of 5 and hardly matter.
Not to mention it stops revives. Which is great with boba and now r-2 around. It's not even a close contest.
Most people are glossing over it because they've never even used it.