new defense : a troop freezing cannon

I have the core idea of a new defense but no idea on how it should look . here is the functioning It is defense that shoots something that hits a single ground troop. This causes the hit troop to stay stationary for about 4 - 8 seconds.Note that it will not move from its place for some duration of time but it can fire if it is not melee. The defense does not fire non stop but once every 4 seconds. range : same as cannon time per shot : 4 seconds Hit troop freezes for : 4 , 5 ,6 ,7 , 8 HP : 450 , 510 , 570 , 630 , 690 , 750 Possible ideas for this defense : Wrapping seed launcher , freeze tower , sludge sling , etc.

This is neither a new troop nor a new spell idea. Please re-post this in the Ideas & Feature Requests Forum.