I have an idea for a trap. It's called the glue pool. Like the spring trap, you must go directly over it, is a 1x1 trap, and only affects ground troops.
When one of your troops goes over it, that troop moves at 1/3 the speed (2/3 the speed for heroes).the duration starts at level one with 5 seconds and adding a half a second for each upgrade. It unlocks 2 at town hall 5 and you get 2 more every other town hall level.
