Quest items

Quest items are items related to any quest.
 * Items obtained only during a quest (which may or may not be tradeable); e.g. Anti-dragon shield
 * Items obtained after a quest as quest rewards; e.g. Ava's accumulator
 * Items that have no use except during a quest which may or may not be kept; e.g. Crystal
 * Items listed as Items needed which are required during a quest but obtainable from stores, monsters or NPCs; e.g. Hammer
 * Items that are used during quest but cannot be put into player inventory even during the quest; e.g. Chalice of Eternity