Strife:Staff of Critical War

Upon cast, tether yourself to a target until the end of combat; cannot Tether on self.

If you’ve healed your Tethered target during combat for (Tethered target maximum HP)×0.75 points, you can choose (before they take their turn) to Overcharge their next turn.

If a Tethered target is on an Overcharged turn, all successful attacks are automatic Critical Hits (akin to rolling a 1 on skill check).