Carlem Aber Camerinthum Purchai Gabindo is a summoning spell. One important use was in both the summoning and banishing of the demon Delrith. After an unknown person delivered it to Wally Prysin's house, he used it to defeat Delrith after the demon appeared at the stone circle south of Varrock. Years later, during Demon Slayer, Denath would lead a group of cultists to use use the incantation to summon Delrith again.
It was also used in Evil Dave's Big Day Out, when Evil Dave summons Zamorak to fight Saradomin during the Assault on Zamorak's Stronghold.
In the historical version of Demon Slayer, a variation of the spell was used by an adventurer to banish Delrith, a feat they had been prophecised to do by Aris. The words were in a different order, dependent upon the player.