The Blackwater Blade is a pirate’s sword from Cyrodiil, first seen in Oblivion. The Dead Man’s Dread Creation adds it to Skyrim as the weapon of Celeste, leader of the Blackwater Brigands.
How to get it
Celeste carries it at Orphan’s Tear, the shipwreck cave on the northern coast. Defeat her during The Restless and loot the sword from her body.
Tips for getting it
- Loot Celeste right away. Her body can fall through the floor and vanish, and then the sword is lost.
Enchantment
Absorbs 30 points of stamina per hit. You get stamina back for power attacks while your enemy loses theirs.
Stats and handling
12 base damage at a weight of 14, between a Steel Sword and an Ebony Sword. It uses the One-handed skill.
Smithing
Improve it with a 
Steel Ingot. It needs Arcane Blacksmith, and Steel Smithing doubles the improvement.
Strengths and weaknesses
- Strength: stamina absorb fuels power attacks and sprinting.
- Weakness: mid-tier base damage.
- Weakness: can be lost to the body bug.
Tips
- Pair it with Cyrus’ Sabre from the same Creation for a pirate-themed dual-wield.
Added by the Dead Man’s Dread Creation, part of the Skyrim Anniversary Edition. Details checked against UESP and summarised in our own words.
