Working on some grapeish thing any advice?

Hi fellow Houdiniasts 😄 Does anyone recognise these black spots when combining emissive materials with the Karma fog box? Denoisers don't know how to handle them.

I've tried all kinds of settings but nothing seems to fix it.

Rendertime: 12+ hours on a Nvidia 4080 super
Resolution: 2540 x 3370 px
Renderer: Karma XPU
Path traced samples: 8192
Color limit: 250 to boost the light in the scene

I have issuses with my displacement maps in houdini solaris, when i use normal grayscale image it works, but when i export either a Height map from substance or a displacement map from zbrush i get the result of the image above. Any ideas what causes this. Thanks

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