First of all, I’ve always felt that there weren’t enough monsters. Like, I’ve always loved the feeling of passing a dungeon, and getting an instant level-up!
Second of all, I’ve always felt that Frost damage was way underpowered. Frosters, Frost Towers, and Blizzard, are among the weakest things in each respective category. Not to mention, there’s no monster for Frost!
So, here’s my idea for an ice monster… Snowman. Yes, Snowman. Here’s what Snowman does. He’s partially a suicide attacker, like Gargoyle. Except, instead of dropping bombs, Snowman periodically detaches his bottom third of himself, and rolls it in a straight line. Each snowball, then, has its own health (Ergo, you can “melt” a rolling snowball with Hellfire). The final snowball, then, the head, will explode on contact, doing enormous damage.
There are 3 reasons why I think this would make a good monster:
It fills the gap between Suicide Bomber and Attacker. Rather than either being a helpless target, or being able to afford to let the monster pass, the hero is encouraged to kill the Snowman so that he can fire off as few shots as possible, hopefully before he rolls out his exploding head.
It takes away the advantage of straight-lined paths. Everyone seems to be using the same straight-lined path nowadays. Wouldn’t it be nice to have a counter to that? Since snowballs can only go in straight lines, but crash upon contact with a wall, straight-lined bases are weak against Snowman, whereas bases with variety are much safer.
Having to run away from giant snowballs would add an extra unit of fun to the game. Especially if the snowballs get bigger and faster over time. Plus, when you scream to call your units back behind a curve, that scream would make sense. Because your hero would literally be screaming. In fact, you might even make the hero scream automatically.