Buff Stacking

[Man-o-Bomb]

Im looking for a way to make an armor reducing buff stack.
Heres an example with a custom Faeri Fire:

Armor Reduction: 0.75
Duration: 10
Cooldown: 6

I use the spell (-0.75 armor), i wait 6 seconds and use it again (-1.5 armor), i wait 6 seconds and use it again (-2.25 armor). If 10 seconds pass without a recast, the buff disapear (0 armor).

How to make a spell stack like this?

 

[Executor]

I don't think stacking Fairy Fire is possible.

In my Opinion you must create a Fairy Fire spell with several levels. And I think you can check the buff level so you can easily recast a fairy fire with a (bufflevel + 1) level.

 

[Bird]

You simply make conditionals.

When a unit casts any Faery Fire spell on a target, you run a conditional... if the target has no Faery Fire Buff.. you have a dummy unit cast Faery Fire 1 on it. If the target has Faery Fire Buff 1 on it already... you have a dummy unit cast Faery Fire 2 on it. So on and so on.