Triggered Ability Help!

[Ignorance]

Ok Hello Hive, I'm trying to remake an ability in DOTA called Geminate Attack.
However I want it to shoot 3x instead of 1x. Also, I'd like that the ability also has a 10% chance to instantly kill the unit.

 

[Maker]

Not everyone playes DotA, so you would do wisely to describe what the spell does.

 

[millzy]

Not everyone playes DotA, so you would do wisely to describe what the spell does.

What he said /\ /\

 

[Ignorance]

My bad umm..
Strafe
The marksman will shoot an extra 3 arrows every few seconds when he attacks.
Bascially i want it so that when a unit attacks it will shoot out 3 extra arrows that do damage within his attack range (including critical) with a cooldown of 2 seconds or so.
If possible can you guys use GUI damage detect?