Buff / Debuff Mechanics Questions

[Kaedis]

There are many from talents or AC specific abilities as well, but most of those are what I would consider 'active' buffs. In other words, buffs that last a short duration and have to be refreshed manually on a regular basis or have a cooldown much longer than their duration. For the most part, however, you're right. Those 4 buffs, plus the damage reduction debuff that 2 out of the 3 tanks have, are the only really required buffs.