Defiler is a medium armor set. When you deal Critical Damage, you have an 8% chance to summon a Hunger that spews poison to all enemies in front of it, dealing 6000 Poison Damage and stunning any enemy hit for 5 seconds. This effect can occur once every 5 seconds.
Defiler is part of the Morrowind chapter and drops in Vvardenfell in the Overland content. You can also find it on Guild Traders. Each set item is bound on equip. You can acquire medium armor, jewelry and weapons for this set in the Hlaalu motif style.