Reduces the duration of all Stun and Charm effects used against you by X%.
"Armor is not just for the outside of a Warrior. The real heroes learn to armor their minds as well..."
Iron Will increases a warrior's resistance to Stun and Charm effects.
It is a passive Arms talent, and is always active.
Primarily a PvP or Raid Tank talent - very few non-boss NPC enemies use Stun or Charm. 3/3 Iron Will can help a great deal dealing with end-game raid named boss encounters - in particular having the main tank turn red can cause a lot of troubles when dealing with end-instance bosses.