help! need to remove damage stacking from my triggered lightning shield

[Maelbog]

I made a custom ability using triggers which appears to put lightning shield on a unit, damaging enemies of the caster but not the actual target. I have to trigger this because i want it to deal damage every 0.1 second. Also i don't want the target unit to suffer, only the surrounding enemy units.
From my current trigger, multiple shields on a single target stacks, causing it to deal more damage than intended.
Here's my trigger.

ElectronCloudCast
    Events
        Unit - A unit Starts the effect of an ability
    Conditions
        (Ability being cast) Equal to Electron Cloud
    Actions
        Set Temp_Point = (Position of (Triggering unit))
        Unit - Create 1 ElectronCloudDummy for (Owner of (Triggering unit)) at Temp_Point facing Default building facing degrees
        Unit - Add a 20.00 second Generic expiration timer to (Last created unit)
        Unit - Set the custom value of (Last created unit) to ((((Level of Electron Cloud  for (Triggering unit)) - 1) x 2) + 1)
        Set ElectronCloudInstance = (ElectronCloud + 1)
        Set ElectronCloudCarrier[ElectronCloudInstance] = (Target unit of ability being cast)
        Set ElectronCloudDamager[ElectronCloudInstance] = (Last created unit)
        Custom script:  call RemoveLocation(udg_Temp_Point)
        Special Effect - Create a special effect attached to the origin of ElectronCloudCarrier[ElectronCloudInstance] using Abilities\Spells\Human\ManaShield\ManaShieldCaster.mdl
        Set ElectronCloudSFX[ElectronCloudInstance] = (Last created special effect)

ElectronCloudPeriodic
    Events
        Time - Every 0.10 seconds of game time
    Conditions
    Actions
        For each (Integer A) from 1 to ElectronCloudInstance, do (Actions)
            Loop - Actions
                If (All Conditions are True) then do (Then Actions) else do (Else Actions)
                    If - Conditions
                        Or - Any (Conditions) are true
                            Conditions
                                (ElectronCloudDamager[(Integer A)] is alive) Equal to True
                                (ElectronCloudCarrier[(Integer A)] is alive) Equal to True
                    Then - Actions
                        Set Temp_Point = (Position of ElectronCloudCarrier[(Integer A)])
                        Set Temp_Group = (Units within 250.00 of Temp_Point matching ((((Matching unit) belongs to an enemy of (Owner of ElectronCloudDamager[(Integer A)])) Equal to True) and ((Matching unit) Not equal to ElectronCloudCarrier[(Integer A)])))
                        Unit Group - Pick every unit in Temp_Group and do (Actions)
                            Loop - Actions
                                Unit - Cause ElectronCloudDamager[(Integer A)] to damage (Picked unit), dealing (Real((Custom value of ElectronCloudDamager[(Integer A)]))) damage of attack type Spells and damage type Normal
                        Custom script:  call RemoveLocation(udg_Temp_Point)
                        Custom script:  call DestroyGroup(udg_Temp_Group)
                    Else - Actions
                        Set ElectronCloudCarrier[(Integer A)] = No unit
                        Set ElectronCloudDamager[(Integer A)] = No unit
                        Special Effect - Destroy ElectronCloudSFX[(Integer A)]

I know that i have to somehow remove the respective dummy damager to make it seem to not stack, but i don't know how because i used array instances.

 

[Solu9]

Hm. Why not just use the normal Lightning Shield spell and set its damage to 0. The every 0.1 second check if the unit has the Lightning Shield buff. If yes then do nothing.

If:
Unit has Lightning Shield buff
Then:
----
Else:
The rest of your actions

 

[Maelbog]

I think it'll only prevent units to cast more than one lightning shield on a unit at the same time.
I want players to replace others' lightning shield with their own lightning shield.
The cooldown of the ability is fast enough to allow a unit to cast lightning shield twice on the same unit, however i wish to refresh the buff instead of making it stack.
If a unit cast lightning shield on two different units, if they are close enough, i want enemies to get twice the damage.

I made a temporary solution for this.
A unit starts the effect of an ability
Ability being cast is equal to Electron Cloud
Unit - Remove ElectronCloudDamager[Custom value of target unit of ability being cast]
Set the custom value of the target unit of ability being cast to ElectronCloudInstance.

 

[Xan_Kriegor]

The cooldown of the ability is fast enough to allow a unit to cast lightning shield twice on the same unit, however i wish to refresh the buff instead of making it stack.
If a unit cast lightning shield on two different units, if they are close enough, i want enemies to get twice the damage.

From my understanding of how the Lightning Shield spell works, that is how it's done. Whenever you cast spells in WC3 that apply buffs, they always override and use the new duration, they don't add on. Similarly, having multiple LS's should do more damage to any intersecting units.

 

[Maelbog]

From my understanding of how the Lightning Shield spell works, that is how it's done. Whenever you cast spells in WC3 that apply buffs, they always override and use the new duration, they don't add on. Similarly, having multiple LS's should do more damage to any intersecting units.

I really want to use Lightning Shield, but i still have to trigger the damage since it deals damage per second only. (not damage over millisecond)
I think LS damages allied units as well.
I want an LS that damages the enemies of the caster but not the target.
I also need a dummy damage source so that the damage works even if the caster died.
Then using triggers, i have to detect whose Lightning Shield is on the unit.
That's how i come up with my temporary solution.

 

[keychup]

If you dont want the damage to stack then how will you be able to detect damage from shields created by different players?

 

[Maelbog]

I don't know how so i didn't use Lightning Shield.
I made damage stacking/non-stacking with triggers.

 

[vypur85]

Add the targeted unit into a Unit group. Then condition it if the unit is already in the Unitgroup then don't deal damage. After the duration, remove the unit from the Unitgroup. Then again, there might be other problems to think about. But let's see what you have in mind then.