I beat the Driftwood Arena on my second playthrough but didn't receive the reward key for some reason, and found it later floating in the air in Wrecker's Cave lol : r/DivinityOriginalSin
Reaper's Coast enemies | Tough fights and bosses - Divinity Original Sin 2 Guide | gamepressure.com
Divinity: Original Sin 2 · Divinity: Original Sin 2 - Definitive Edition (App 435150) · Achievements · SteamDB
Driftwood Arena Treasure in Hidden Hatch | Divinity: Orignal Sin 2
Driftwood Arena Treasure in Hidden Hatch | Divinity: Orignal Sin 2
The Driftwood Arena, Divinity: Original Sin 2 Quest
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The Driftwood Arena | Game of Guides
The Driftwood Arena, Divinity: Original Sin 2 Quest
The Driftwood Arena, Divinity: Original Sin 2 Quest
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The Driftwood Arena | Game of Guides
The Driftwood Arena | Game of Guides
Reaper's Coast enemies | Tough fights and bosses - Divinity Original Sin 2 Guide | gamepressure.com
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Divinity: Original Sin 2 · Divinity: Original Sin 2 - Definitive Edition (App 435150) · Achievements · SteamDB