Since there are no longer gates we need some new sprites. Here's what I'm thinking.
A freeze sprite: Ponton first skill: sludge. Shoots out chameleon freeze balls in 360 that last 2X as long as normal chameleon sludge balls Freezes.
Upgrade with focus, more blobs, and longer effect.
2nd skill. Mist. Like sivermist. Freezes and causes dmg. Effects like trap but way bigger. Anything still trapped when mist is gone will get "frostbite" takes dmg like fire but when it moves. Range is about 2/3 size of shivermist.