The Aqua Tower
This tower makes a water square, when enemys step in they will be slowed down and a bit dameged (Upgrade 1: creates a 2x2x2 water square,tier 2: 3x3x2, tier 3: 4x4x2, tier 4: 5x5x2
It gives no damage or slow effect to flying mobs.
It's extra effective against mobs such as magma...