The Worm's Raiment is a light armor set. The 5-piece set bonus reduces the cost of your Magicka Abilities by 4% for you and up to 11 other group members within 28 meters of you.
When wearing this set, make sure to stay within a reasonable range of your group members. The buff will disappear for them if you get out of range or if you are in a different instance.
Players wearing this set can be recognized by blue orbs floating around them.
The Worm's Raiment set is part of the base game. It drops in Vaults of Madness in Coldharbour. Each set item is bound on pickup. You can acquire light armor, weapons and jewelry of this set in the Worm Cult (unique) motif style.