Warrior · Protection · tier 2 · from level 15
Improved Thunder Clap
6 less rage
3/3 · Thunder Clap
Improved Thunder Clap
Rank 3/3
Reduces the Rage cost of your Thunder Clap ability by 6.
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.