[Spell] Create a holy shotgun spell (art + functions), how?

[Aphystic]

So I'm working on an ORPG with a friend of mine and we're both rather new to all this and we're at the stage where we wanna create our own heroes, right. I wanna create a holy shotgun (very like the one in diablo 3). It should be a passive or toggle and every autoattack should release 3 waves of holy light in an arc (doing aoe damage if possible, otherwise single target). So am I able to make the art myself and import in the world editor or am I screwed? And how am I supposed to make this spell work like I want it to?

I posted this at "request" as well as I was unsure of where I would put this.

 

[Dr Super Good]

You will need an attack damage detection system. Some should be pre-made so easy to use.

Getting the angles for the launches is a matter of simple high school maths. For example unit facing, unit facing + 30, unit facing -30.

The damage beams are a bit more complex. Fortunately there exist pre-made functions which will enumerate all units in a arc/rectangle. Use such a premade system to run from the caster unit in the calculated angles for the desired distance. Then damage all those found units the desired amount of damage.

 

[Aphystic]

You will need an attack damage detection system. Some should be pre-made so easy to use.

Getting the angles for the launches is a matter of simple high school maths. For example unit facing, unit facing + 30, unit facing -30.

The damage beams are a bit more complex. Fortunately there exist pre-made functions which will enumerate all units in a arc/rectangle. Use such a premade system to run from the caster unit in the calculated angles for the desired distance. Then damage all those found units the desired amount of damage.

Is there any way you could show me how to do this? And do you know how I'm supposed to change the spell art to the desired art?