Spell Strategist 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 Light Armor.
2 items: Adds 12-1096 Maximum Magicka
3 items: Adds 1-129 Spell Damage
4 items: Adds 1-129 Spell Damage
5 items: When you deal damage with a Light Attack, you place a mark over your target for 5 seconds, granting you 5-500 Spell Damage against your marked target. This effect can occur every 4 seconds.
The set consists of light armor and jewelry in all slots, as well as weapons and shields of all types.