From Guild Wars 2 Wiki
Hint: Use the Gloominator to capture the gloom in the icy cavern of Tribulation Caverns in Dredgehaunt Cliffs.
— In-game description
- Use your Gloominator in Tribulation Caverns at the bottom of the large ice cave.
- When you first enter the cavern after completing Tribulation Rift Scaffolding, you start going down a long slope, and would normally turn right and start hopping on the icy pillars to continue the puzzle. To get the gloom, keep going down to the lower part of the cave towards the water.