No Rune:
Cooldown: 8 seconds
Summons a pool of deadly piranhas that deals 400% weapon damage as Poison over 8 seconds. Affected enemies will also take 15% increased damage.
Piranhado
The pool of piranhas becomes a tornado of piranhas that lasts 4 seconds. Nearby enemies are periodically sucked into the tornado.
Increases the cooldown to 16 seconds.
Here is my question:
Piranhado lasts for 4 seconds. This refers to the tornado.
But what about the “take 15% increased damage” debuff?
A) Does it lasts 4 seconds? or
b) Does it lasts 8 seconds?