The Scadutree Avatar is an optional Legend Boss introduced in Elden Ring: Shadow of the Erdtree. You don't need to defeat it to complete the game. The Scadutree is the shadow of the Erdtree.

Remembrance of the Scadutree Avatar, hewn into the Scadutree. The power of its namesake can be unlocked by the Finger Reader. Alternatively, it can be used to gain a great bounty of runes.