Escape the Bathhouse
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All Assassin’s Creed: Origins Guides

To assassinate Eudoros in End of the Snake in Assassin’s Creed: Origins climb up one of the pillars near the guards at the entrance to the area where Eudoros is bathing:

To assassinate Eudoros climb up one of the pillars near the guards.

Climb up to the walkways above and go to the area above Eudoros. Assassinate Eudoros from above.