A writer on EJ did enough tests to confirm the length of [Bone Shield] internal cooldown, for each charge to be used up: 2 seconds. It might be slightly lower than that, in fact, but its certainly no longer. He got 40 mobs to attack him and looked at the time between bone shield activation and it fading.
Bone shield is not 2.5 or 3 seconds, as often quoted around the internet. It’s a measly 2 seconds, maybe slightly
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