White Noise and the last boss level of Council Apocalypse. It's horribly skewered in antag favor. the raiders have to walk through mines, Hollow ones, Elites, bubbles, drones, beholder lasers, electric fields and try not to die while performing acrobatics, but you as an antag can merely walk through the solid miasma of death and casually pick them off. Farm these two stages. I purposely avoid them, even without the antag.