Flaming Arrows

okay, ive been trying to figure this out forever but i can get it. So could someone make it for me?
heres how it goes:
its a hero passive ability with 3 levels.
When the hero attacks someone while having this ability, the unit takes damage, like 70 or something, then a fire is created at the spot. When a unit gets near the fire it gets a buff, or something that makes it lose 1 health per second.
on level 1 it last 15 seconds
on level 2 it last 20 seconds
on level 3 it last 25 seconds
The model for the fire that gets created is the fire <base> doodad. for units with the buff, fire gust gets attached to thier origin. and if possible, make it so that if a non-burning unit gets near a burning unit, it gets burnt also. Just make it on a lil 64x64 map, i can implement it into my map.
·Thanks

edit: oh yeah, a good spell to base it off is disease cloud (meatwagon) but it needs an artillery attack type, and that wont work for me.

Im kind of at skool now so i cant make a little map but

If u need to edit a buff go to the object editor and go to buffs and make ure own there. For the fire going near someone and the other person u have to use a simple trigger.

Oh yeah make the Art - Target into the fire <base> doodad

Sorry i cant give exact coz im at school but it should be too hard.

a buff wont fix it. and it either uses the poisen model or nothing. it uses the original buff it wont use custom buffs.

How about centering a region on where it is cast, and every 1 second pick all units in that region and subtract 1 from their health.

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In the spell trigger add, run trigger (the above trigger)
wait X
turn off trigger (the top trigger)

Could someone else PLEASE!!! do this for me? im sure anything i try will go wrong or ill be doing it wrong, and ill be asking questions and it will take forever!! so i mean, im just sick of this ability.

ummm.... if u think something will go wrong make a backup copy, and i think the region thing could be a bit of hard one considering it might deduct the health but you also have to create a timer for howlong it lasts, if u do do that you could also create a timer for the fire doodad as a special effect on the target

i was trying it but got stuck.

I had a dummy caster that summoned modified plague wards when the user attacks. he would summon a different one depending on the spell level. problem is i cant figure out when the hero attacks and connects. the function issued order = attack activates when he is issued to attack, not when it connects. so you could tell him to attack a unit halfway across the map and the flame will be summoned next to him.
i was also gonna have it so when the enemy had the plague/fire buff to give him the abomination plague ability but with different targets and any unit that gets infected with this plague has a buff that when detected gives it plague and so on.

Sorry to say this but after hearing what Pyrus said, i doubt its possible since there is no trigger event saying unit gets hit by - there is only unit attacks

I actually like pryus' idea. But instead of issued order, use unit begins casting an ability. and then you can use "target unit of issued order." I also got a PM that sounded good. So im gonna go try some of these ideas.
Edit: oh, i looked at it again, it would work if i used a castable spell like storm bolt
Edit2: theres another prob. i cant add abilitys. or else, the unit would have the buff, get the ability, and next time i checked to see who had the buff... he may still have it and get the ability again.

does unit begins casting an ability work with passive abilities? If not have it as an auto cast ability because that will be able to detect target.