Critical Strike type skill question.

Im wondering how to make a critical strike type skill, where it gives a percent chance to do a special attack along with the critical, so far ive had no luck, i dont know how to use JASS, but if need be ill learn how to to complete this skill.
Any help would be appreciated, thanks in advanced.

What kind of special attack are you going to have?

you dont need JASS for that, although if you want the special attack to conincide with the critical strike then its a bit harder, what exactly do you want to do, i think i can come up with a workaround.

I was thinking of like a critical strike with an area of effect, like when it crits it deals damage to all units around you instead of just one.

oh, i dont think thats possible, i dont know of any way to detect when a unit critical strikes.

Wait a sec, just use the orc spell "Pulverise" its a chance to hit spell that deals damage in an area around you.

Guess ill just do that then, thanks for you help.

Cleaving strike isn't a percent I think. You can change the dmg to like 200% (double damage), etc.

not cleaving strike, pulverise!

Couldn't you use bash too?

bash has no area effect.