- "The walking woodwork with purple leaves certainly is hostile. Not one to stay rooted in one place, it will track you down to attack."
- — EarthBound Player's Guide
The Hostile Elder Oak is an enemy encountered in EarthBound in the Deep Darkness area. It is an improved version of the Territorial Oak with purple leaves and a greener trunk. The Hostile Elder Oak attacks using both regular and PSI moves. Fortunately, the only PSI moves this creature knows are Brainshock α and PSI Magnet α. Its weakness is PSI Fire. Like the Territorial Oak, once defeated this beast will burst into flames causing damage to the party.