To find the Ark Toolbox Key in the Dead Island 2 Haus DLC, travel to the Ark during The Ark of Ascension main quest. Once there, you’ll find the Architect, who is a Crusher. Take him out then loot the Ark Toolbox Key!
Once you have the Ark Toolbox Key, travel through the area until you reach the area with all the hanging bodies as shown on the map below.
By the workbench you’ll find the Ark Toolbox! Unlock it to receive a blueprint!
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