Steadfast Hero is an Rewards for the Worthy Set. Set pieces are also awarded via "Rewards for the Worthy" mails by participating in PvP. Pieces are Aldmeri Dominion, Daggerfall Covenant, or Ebonheart Pact Style in Heavy Armor.
2 items: Adds 34-2975 Physical Resistance
3 items: Adds 34-2975 Spell Resistance
4 items: Adds 14-1206 Maximum Health
5 items: When you cleanse a negative effect from yourself or an ally, gain Major Protection for 5 seconds, reducing your damage taken by 30%. This effect can occur once every 10 seconds.
The set consists of heavy armor and jewelry in all slots, as well as weapons and shields of all types.