Warrior · Protection · tier 4 · from level 25

Improved Sunder Armor

Rank 3/3

Reduces the Rage cost of your Sunder Armor ability by 3.

Doesn't change the damage or healing of any Warrior spell.

Averages, counting crits and misses, for a level 60 Warrior with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.