How to make Item skill Passive Chain Lightning?

[Allain55X]

I have a game in progress and Im wondering how to create an Item skill Passive Chain Lightning? Its a skill from an item and gives a chance to activate and deals damage. Pls show step by step in case your gonna show it in trigger. Thank you!

 

[Erkki2]

You could use orb of slow - ability. Just change the ability from slow to chain lightning. This is the easiest way to do it, but the drawback is that it requires unit to be ordered to attack, else the lightning isn't triggered even with 100% chance.

 

[Chizume]

A good tutorial ^

 

[Allain55X]

Thanks to all who help me here but I must say that Erkki2, your the one who really helps a lot! Here's a +REP and an additional +REP for Chizume. Thanks y'all!