Introduced in the Infiltration event.
Banished weapons are found on the corpses of the rare Banished creatures. These creatures may be found in the northern and southern 40 - 60 / Mid spawn areas which are displayed as light green on the Dereth Spawn Distribution map. Banished weapons drop 100% of the time. Unwanted banished weapons can be given to Belinda du Loc in Stonehold for 1% level xp (max 500,000xp).