For a list of quest items see: Category: Quest Items
Quest Items are given to and found by players for the sole purpose of completing quests. Quest items do not always appear in a players inventory, but when they do, players are able to interact with them to complete various quest tasks.
For more information see: Equipment
For more information see: Costumes
Costumes are items worn for their appearance only. Costumes do not provide a player with any stat bonuses.
For more information see: Consumables
A Consumable is an item that disappears once used. Consumables can grant players buffs, change appearances, restore health, resurrect dead players, teleport players, and more.