Battalion Defender 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 HeavyArmor.
2 items: Adds 14-1206 Maximum Health
3 items: Adds 12-1096 Maximum Stamina
4 items: Adds 2% Healing Done
5 items: After successfully blocking, heal yourself or a group member within 15 meters of you for 23-2000. This effect can occur every 1 second.
The set consists of heavy armor and jewelry in all slots, as well as weapons and shields of all types.