
what about this idea?
every 3 or 5 seconds, Leviathan fires side cannons, maybe 3 or 6 cannon balls? and each cannon ball has a chance to miss a target by certain % depending how many cannon balls are used on Leviathan, and if cannon balls hit the target. does certain amount of damage to the target.
Leviathan main attack could remain the same with side cannons as a passive skill.