
Naoki00 |

Alright new question since I can't seem to find a concrete answer. When using this ability of the Berserker Sphere:
"Brutal Strike
As a special attack action, you may make a melee attack against a target. Creatures damaged by a brutal strike gain the battered condition until the end of your next turn. You may expend martial focus to have the attack deal additional damage equal to twice your base attack bonus."
Does this damage become multiplied by a critical hit or is it added onto the final total?

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The damage from Brutal Strike is static bonus damage and as such is multiplied on a critical hit.
As already noted, generally the only things that aren't multiplied on a critical hit are bonus damage dice (such as those from weapon enhancements like the flaming property or Vital Strike) and precision damage.