Zones drop pieces from their sets:
- Delve bosses drop a waist, foot, or unique item piece.
- Overland bosses drop a head, chest, leg, weapon, or unique item piece.
- Public dungeon bosses (including champions) drop a shoulder, hand, weapon, or unique item piece.
- Chests at World Events, most commonly Dark Anchors drop a jewelry set piece.
- Treasure chests have a chance to grant any set piece that can drop in that zone; the chance is increased by having the Treasure Hunter champion perk.
- Zone story quest rewards are often part of overland sets.