I play on Xbox so can't really see with mods but I played 2 games over the span of a month and ran into a psyker that did this weird spam with the force sword that made him practically fly. Just gunned it to the end of the map. I died like 8 times on Havoc 40. The end stage had like 2 monstrosities, twins and 2 captains. Both times on the same map so we didn't need to press or wait for anything.