Lethal Accuracy

While in the lethal stance, the barbarian's critical multiplier for damage increases by 1 (a ×2 multiplier becomes ×3, a ×3 multiplier becomes ×4, and a ×4 multiplier becomes ×5). A barbarian must have the lethal stance and deadly accuracy rage powers and be at least 16th level to select this rage power.

Lethal Accuracy — Kingmaker