Rivermouth Cave, an optional dungeon nestled deep within Gravesite Plain in Elden Ring’s Shadow of the Erdtree expansion, holds a powerful Spirit Ash waiting to be claimed. This walkthrough ensures you uncover all its treasures and navigate its challenges effectively.

Exploring Rivermouth Cave

Locating the Cave:
Rivermouth Cave is discreetly situated at the top corner of the Ellac River cliff face, accessible from the lowest levels of Gravesite Plain. Approach it either through the route leading to Cerulean Coast or descend from the Temple Town Ruins in the Ancient Ruins of Rauh.

Entering the Cave:
Activate the Site of Grace ‘Rivermouth Cave’ and proceed inside. In the initial room, dispatch several wolves to secure 2x Hefty Beast Bones from a nearby corpse.

Exploring the Path:
Continue along the path, turning right into a dead-end room where 3x Sliver of Meat can be gathered from another corpse after dealing with wolves.

Advancing Deeper:
Return to the main path and follow it to a larger room where wolves descend from rocky platforms. Dispatch them with ease before climbing the slope to collect loot from a corpse, triggering a collapse that leads you deeper.

Discovering the Chamber:
Descend into a large chamber where trolls are engaged in a mysterious ritual. Stealthily navigate around the room’s edge, eliminating trolls silently to avoid drawing the entire group’s attention.

Gathering Supplies:
Proceed up a narrow passageway where additional wolves guard 1x Sacred Bloody Flesh on a nearby corpse. Follow the path back up to the initial chamber if desired, ensuring all Elden Ring items are collected before advancing further.

Facing the Boss:
Having cleared the chamber, confront the Chief Bloodfiend beyond the boss fog door. Prepare for a challenging encounter to claim victory and complete the dungeon.

Conclusion
Rivermouth Cave in Elden Ring’s Shadow of the Erdtree expansion offers both exploration and combat challenges, culminating in a significant confrontation with the Chief Bloodfiend. Use this walkthrough to navigate its depths, collect valuable Elden Ring items, and emerge victorious against formidable foes.