I play solo and I have found that the spwaning mobs when you reach the 10th wave are somehow scattered and based on luck. Sometimes you get a bunch of just giant skeletons and sometimes just little ones. Theres also no big difference when running an enhanced or non enhanced run. It would be great to tune down the algorithm of the spawning mobs to for example spawn just 1 or 2 giant skeletons after X number of little skeletons instead of 3 or 4 at the same time as Ive experienced running the event.

~LUCKYLOBO~