Death Mark

The  is a new item in Risk of Rain 2.

The linear stack rate make this item incredibly powerful once enough activating items have been acquired.

Activation
Death Mark is activated by 4 unique debuffs on a target.

These debuffs do not need to be applied by the same player and once an enemy is marked it will remain marked until killed.

Characters without the death mark item still deal the bonus damage to marked enemies. [1] Needs more testing

[2] Needs more testing

* Note that Death Mark does not activate if you only have 4 stacks of the same debuff. The number of stacks is irrelevant. Just the number of different debuffs must be 4 or higher.