Sets are groups of items that provide powerful extra bonuses when matched pieces are equipped, up to a maximum of five pieces. It is possible to receive benefits from more than one set (e.g. getting the 2-item bonuses from four different sets). If you Dual Wield or use One Hand and Shield, you have twelve equipment slots open to you. If you are using a Two Handed or ranged weapon, you'll only have eleven slots. Most sets are available in all armor slots and in most traits.
Sets are divided into two main types - bind-on-equip and bind-on-pickup. Bind-on-equip items are permanently bound to your account only when you equip them. Bind-on-pickup set items can only be traded for two hours after the item is received and only with other group members within the instance when you received it; after which the item is permanently bound to your account.
Craftable Sets can be created at various locations. To craft set items, you must find one of their special crafting sites. For most sets, there is one crafting site in each Alliance's territory. Other sets become available upon completion of certain quest lines, including the Fighters Guild, and the Mages Guild. Some crafting sites are found in DLC zones, and can only be accessed if you own the DLC. Nevertheless, it is possible to wear gear from those sets even if you do not own the DLC, if someone else crafts the gear for you. All crafted gear is bind-on-equip.
As jewelry crafting is not currently available, crafted set items can only be made for the seven equipment and two weapon slots.
Dungeon Sets can be found from normal and veteran Group Dungeons. Bosses and minibosses will always drop pieces from these sets in specific slots. Dungeon sets are all bind-on-pickup, but you can trade them with your dungeon group for a while after picking up.
Monster Helm Sets
Monster Helm Sets are a subset of dropped sets of armor. The head pieces have a chance of dropping from the boss of the associated Veteran mode group dungeon, while the shoulder pieces may be found in Undaunted reward chests.
Overland Sets are dropped by monsters within the starter zones, the fifteen main Alliance zones as well as Coldharbour. Each set has a specific zone that it drops from. Set items can be found from World Bosses, delve monsters, public dungeon monsters and treasure chests found within the zone. Quests in zones will also reward set items from their respective zone sets.
PVP Sets can be purchased using Alliance Points or Tel Var stones. Vendors will sell boxes that contain a random piece of each set.
Trial Sets are available from any of the Trials in the game. Bosses in Trials will drop pieces of these sets. Trial sets are all bind-on-pickup.
Jewelry Sets are available from PvP vendors, reward mail, and first dungeons. They do not include armor pieces, but a subset of weapons, shield and jewelry. Some Jewelry sets items are bind-on-equip, some are bind-on-pickup.