Djinn of Rituals

The Ritual Fiend Monsters are a series of two monsters released in the booster pack Stardust Overdrive. They each share the effect text "If you Ritual Summon a Ritual Monster, you remove from play this card in your Graveyard as 1 of the monster's Level required for that Ritual Summon." followed by their individual effects, which are given to the Ritual Monster they were used to Summon. The only Ritual Fiends released so far have been "Ritual Fiend Releaser" and "Ritual Fiend Presider"