Onslaught Needs To Spawn Enough enemies

[Unitanubis]

The only way you should fail in onsluaght is when you can't kill the enemies fast enough not when there aren't enough to kill. Fix the spawn rates for some of the enemies and tiles.

[Tyanya]

I came to the forums after just experiencing this in a drastic way, got to zone 5 (normal mode, solo) and there were only 2-4 mobs on the tileset at any one time, of course my efficiency fell through the floor and I barely made it to zone 6 at which point it ended. 

We can only be efficient at killing enemies if there are enemies to kill. :)