Black Cove cloud

[hlboudon]

How does one get past the static cloud? One of the characters says something about covering the source and I can see it, but what do I use and how do I put it there? Anyone who touches it is stunned. Walkthroughs are no help. They don't even mention it.

[Cult of Tzeentch]

You can drag barrel that lying arround there and drop it right on top of the trap pit