When does a unit take damage from a spell?

Basically, I have a spell based off chain lightning - it's supposed to be the hero turning into a lightning bolt and rapidly striking random units along its path, what I want to do is to have the hero appear at each unit struck by the chain - and I have not got a blind clue how it could be done. Not even an ickle one - any ideas?

You could trigger it so that at the relevant points he's suddenly "offset" -- I've seen it done with various Trample/Charge abilities (modified Shockwave) and with Omnislash ...

I thought I could do that, it's just a matter of telling the game where she should be offest to, if you know what I mean. Since chain lightning is a randomly bouncing skill, I can't exactly predict where it will be, since every situation is different. what I'd love is a trigger "unit takes damage <from a spell>" just a shame it doesn't exist.

Thanks a lot for confirming method of movement, now I just need co-ordinates or something. Anyone?

You could make the complete chain lightning triggered, but that isn't very easy. Therefor you must have some experience with triggers.

Basicly, you make a custom (dummy) caster and a custom chain lightning that doesn't bounce. Let the hero target one unit with another dummy spell and create a caster at his position, then pick a new random target, maby storing it in a variable, and create a caster at the previously targeted unit and do this as many times you want.

I was somewhat fearing that was the case. Arse, if everyone will pardon my irritated english, well I could probably figure it out, something like create caster here, , move dechala to point of last spawned unit, play attack animation, order it to cast the spell, kill caster, pick random unit within X, repeat would probably work, and I could just make a few different spells based of chain lightning for the dummy units to simplify things. Now that I think about it, it doesn't seem too horrendous, I just didn't particularly want to have to do some relatively complex triggering, what with my triggers being effective, but probably clumsy, sinve I learned on starcraft ages ago and just mess around with em. Ah well, thanks a lot everybody. Though if anyone comes up with another idea, I'm always open to them (especially if it involves less triggers :p)

I'm sorry it doesn't use less triggers, but the way I see it, there isn't a way to check who and when a unit will be hit by chain lightnig.

Don't apologise, thanks for the help, confirmation and keeping me from wasting time searching for another way, I'm gonna make it like that, should be an interesting touch to my map.