Level 3 Imps are unused non-player characters that previously appeared in the Imp Catcher quest. Originally, Wizard Grayzag had a combat level of 41 and could be fought by the player, during which he would summon stronger variants of Imps. In 2006, the quest was reworked; from now on players could only talk to Grayzag instead of fighting him. Therefore, the stronger imps could no longer be encountered in game, although they remained in the game files and were graphically updated several months later.
As they became discontinued before August 2007, they have never been present in Old School RuneScape. Ultimately, they were removed from the game files altogether on 6 January 2021.