Originally Posted by Dorei0sama

It seems there is less and less life crystal rewarded (last event also around 5 life crystal).Normally it should be around 8 life crystal in ultimate map.

Cant really say, cause I started playing in November and back then I struggled even with Advanced maps. In those events I was able to do Advanced/Ultimate they all had IIRC 2/5 crystals with those 0.05-0.0625 crystal to stamina ratios