(2 items) Adds 1096 Maximum Magicka
(3 items) Gain Minor Slayer at all times, increasing your damage done to Dungeon, Trial, and Arena Monsters by 5%.
(4 items) Adds 129 Weapon Damage and Spell Damage
(5 items) When you activate a synergy while in combat, you gain a shadow blessing that increases your Weapon Damage and Spell Damage by 474 or a lunar blessing that increases your Magicka Recovery by 474 for 20 seconds. You can only have one blessing active at a time.
The Moondancer set is part of the Thieves Guild DLC. It drops in the Maw of Lorkhaj Trial in Reaper's March. Each set item is bound on pickup. You can acquire light armor, weapons and jewelry of this set in the Dro-m’Atrha motif style.