Boon of Bul-Kathos Boon of Bul-Kathos
Base cooldown of all three Rage skills is reduced by fixed amount:

The aid of the Immortal King shall come to those who have earned it.

Boon of Bul-Kathos is a Barbarian passive skill in Diablo III, unlocked at character level 60.


This effect is applied before any other methods of cooldown reduction are taken in account.