Dung Eater Questline — Step-by-step

Collect the Seedbed Curse from the corpse above the Perfumer room.
📍 Leyndell Royal Capital
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Give Dung Eater a Seedbed Curse to receive the Sewer-Gaol Key.
📍 Roundtable Hold
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Unlock Dung Eater’s cell with the Sewer-Gaol Key.
📍 Leyndell Sewer Gaol
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Tell Dung Eater to leave his gaol.
📍 Leyndell Sewer Gaol
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Read Dung Eater’s message directing you to the outer moat.
📍 Roundtable Hold
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Enter the water and kill the invading Dung Eater.
📍 Outer Moat
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Speak to Dung Eater and agree to bring him more Seedbed Curses.
📍 Roundtable Hold
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Collect the Seedbed Curse from the corpse in the Roundtable Hold replica room.
📍 Fortified Manor Leyndell Royal Capital
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Use two Stonesword Keys to reach the corpse with a Seedbed Curse.
📍 Volcano Manor
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Collect the Seedbed Curse from the corpse northwest of the Prayer Room route.
📍 Miquellas Haligtree
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Collect the Seedbed Curse from the corpse below the two-knight room route.
📍 Miquellas Haligtree
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Give Dung Eater five Seedbed Curses to receive the Mending Rune of the Fell Curse.
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Dung Eater Face the quest giver behind this dark path and its unsettling reward. Mending Rune of the Fell Curse See the rune rewarded by completing the Dung Eater’s questline.

Elden Ring: Full Dung Eater Questline (Complete Guide) - All Choices, Endings, and Rewards Explained — Its Shatter · via YouTube