Active Orb of Lightning (new)

[meshuggah]

Hello.
Is there someway to create an active orb of lightning unit skill?
To be exact, I'm trying to create an attack-spell that deals damage based on the unit's actual damage, is unit-targeted, has a cooldown and a manacost. The sub-effect, if that attack hits, is a slow, based on the human sorceress Slow spell. So far I've made the ability as a 100% chance hitting Orb of Lightning (new), and changed the effect to the wanted one. Problem is, the skill itself works passively on attacks (if the cooldown and manacost conditions are met), while I want the user to be able to use it whenever he wants.
Please don't go posting ideas if you're 'just guessing' or 'havent tried it myself but mb it works', I have enough guesses and failed tries myself.
Thanks!

 

[Pharaoh_]

You can make the ability active as it should be and have a trigger, checking whenever a unit is attacked to create a dummy unit and Unit - Order (Last created unit) to Human Sorceress - Slow (Attacked unit). So, the passive effect will be the triggered case, since Orb of Lightning can't be active.

 

[meshuggah]

Yeah, no thanks.
Lets say I'd base it off Searing Arrows or smth, and check on unit is attacked for the sub-effect.. The only outcome would be having stupid results like the attack missing and the target still getting slowed or I don't know what. And basing it on anything but XXX Arrows would result in having a preset damage ability rather than one that deals damage depending on the unit's damage range. So, thanks but you're not of help.