Cerberus

Cerberus is a level 318 hellhound boss that is located deep beneath the Taverley dungeon in the cave entrance in the northeast part of the hellhound area which is found beyond the poisonous spiders. Four are guarded by the Key Master, where they are contained behind four iron gates.

Cerberus requires both a Slayer level of 91 to kill and a slayer task of Cerberus itself or hellhounds. It is the only monster to drop primordial, eternal and pegasian crystals, which can be attached to the Dragon boots, Infinity boots and Ranger boots respectively, providing best-in-slot boots for melee (the primordial boots), magic (the eternal boots), and ranged (pegasian boots). In addition, it is also able to drop a smouldering stone, which when combined with a dragon axe or dragon pickaxe can add a "heat element" to the tools, allowing the dragon axe to become an infernal axe and the dragon pickaxe to become an infernal pickaxe.

Cerberus will occasionally rear up and howl Aaarrrooooooo to summon 3 souls, which attack using each of the combat styles (Melee, Range, Magic). Their colour coordinates to their attack style: Red is melee, Green is Range, Blue is Magic. Their order is randomized, but they always attack from west to east (Left to right if you’re looking at the skull). Pray flick as they attack to mitigate their damage. The Spectral spirit shield keeps your prayer from being drained by 50% by the souls.

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Trivia

 * In Greek and Roman mythology, Cerberus is a multi-headed hellhound with a serpent's tail, a mane of snakes, and a lion's claws, guarding the entrance of the Greek underworld to prevent the dead from escaping and the living from entering. This reflects the area around Cerberus as it guards the rivers that take souls to the Underworld.
 * Cerberus stands on a trapdoor as a reference to the book 'Harry Potter and the Philosopher's Stone'.