From Guild Wars 2 Wiki
Irradiated Ooze is a trophy required for the The Juggernaut III: The Colossus legendary weapon collection.“
— In-game description
- This can be obtained in the Cooling Chamber of the Thaumanova Reactor Fractal.
- Make sure to have your Ooze on before entering. You only need enter the first section, not the main room.
- This item does not enter your inventory. It is added directly to the collection.