Tips in Pillar Chase 2

Round begins in 3.. 2.. 1.
If you are playing MX and if a survivor uses energy burst, use POW hop because they can't jump while running fast
Does anyone know a good way to use "Charging Demise"
What happens to monster when you upgrade him to level 100, does he become stronger, or what? (I'm new to Pillar Chase 2 and I don't know much, that's why I'm asking.)

How am I going to buy skins now if the majority of those skins say this?