Cooldown stacking quick Q
Small question regarding prot pally cd mechanics.
I was reading around some forum (forgot which) the other day and came by a guy stating that Argent defender and divine protection stacked additively when used simultaneously (20%+20% = 40%). I alweys beleived all cooldowns stacked multiplicatively (20% of total damage, then 20% of remaining). He said that GoAK stacked multiplicatively with each of them, its just additive when its between those two specificly.
I just wanted to ask you guys if you could confirm/deny this information.