Corporeal Beast - The RuneScape Wiki

The Corporeal Beast is the physical incarnation of the Spirit Beast, and is a boss monster. It requires completion of Summer's End to fight. The Corporeal Beast was brought into existence when the Spirit Beast was killed at the end of Summer's End; as everything within the Spirit Realm represents the opposite of its version on Gielinor, the death of the Spirit Beast in the Spirit Realm caused the creation of the Corporeal Beast in Gielinor. The Corporeal Beast resides in the Gielinor version of the caverns in which the Spirit Beast was trapped and destroyed.

Corporeal Beast should get a graphical rework. : r/runescape

Boss, Old School RuneScape Wiki

Corporeal Beast - OSRS Wiki

Corporeal Beast completed log : r/2007scape

Corporeal Beast display - OSRS Wiki

Cerberus - OSRS Wiki

Corporeal beast - GrinderScape Wiki

AFK Corporeal Beast Guide (5M/hr) - RuneScape 3

Update:Corporeal Beast, Old School RuneScape Wiki

Corp Beast High-Level AFK Guide - 58 Kills/Hr (RS3)