Damage: Medium Damage, low variance
Attack Speed: 1.5-2
Ability: Charge it up!
Channelers in range combine their attacks, so that attacks will jump to additional creeps. The basedamage will increase by 50% per Channeler, if there is only one target. (+1 jump per Channeler)
Model could look like a mage wielding a staff. On attack every channeler raises his staff (using attack speed of closest tower) and a spell jumps through every channeler furthest to closest and then to the creeps.
(Basically a Prism tower of a certain strategy game :) )