I've just made aware via a fan on the Nexus that Kuan's Breath is currently broken in 2.4.
Basically, right now it's more like "Kuan's Peace" because it makes all enemies into friends.
This was an unintended side-effect of making the Sakkara Demon no longer turn against the player when the duration expires. Seems enemies under the influence of Kuan's Breath are assigned the same faction as the Sakkara, "FACTION_GODSPELL".
I'll try to work out a solution that doesn't break the new Sakkara behavior.