Nether Cannon

[Karawasa]

Each attack, this tower deals damage based on the time it channels on the target. The charging time should be configurable, much like Radius's range is. There should be 10 charging configurations; 0.31, 0.5, 0.7, 1, 1.5, 2, 4, 7, 11, 15 seconds. The increase of damage interval should be 0.1 seconds. The multiplier should be 1.0375. Thus, the DPS increases by 3.75% every 0.1 seconds. There would be a base damage of X. So damage dealt is x * 1.0375^i. For clarification; by waiting the full 15 seconds you do about 5x more damage than if you attack every 0.31 seconds.

This may remind you of Alchemist's ability from DotA.