How can this be done effectively?

[Salkin]

So, I'm making a spell that's Frost Nova with a twist: it creates ice pillars at random points within 600 of the target for 5 seconds.

The thing is, is it possible to do in GUI or will I have to resort to JASS?

 

[Avator]

Sure. You make an event and Condition that marks the ability being cast, you make an action that makes the area of effect within X range of the position of the ability being cast (TempPoint), and you create let's say 5 units with those ice pillar models at 5 random locations in that area. At the end, you destroy TempPoint to prevent leaks.

 

[PoZoR]

you have to detect the region within range of target point/unit of ability being cast,

Loop for integers 1 to 5
set temp point as random point within 600 range of target point/unit of ability being cast
create 1 ice pillar at temp point
remove temp point leak via custom script