Bouncing attack?

[TheBigMetalHandInTheSky]

(THIS IS A SPELL REQUEST!)
I want to make a bouncing glaive attack that hits 3 targets and then the projectile returns to the caster (like the spell shown in this video:

). How could I make this in the trigger editor?
If variables are given, please show the type of variable (e.g. Unit, Boolean, etc.) so I can create them correctly!
Thank you!

 

[Tasyen]

Here is a spell fitting the request:
To change Data check out "Bouncing Light init".
The Trigger Editor Contains a how to import Information.

Edit: Credits: BPower Missile [GUI] version 1.6.1

 

[TheBigMetalHandInTheSky]

Thank you very much!