I've never created a spell before, only tweaked a couple details. But, I was thinking about something involving the Void Domain
Void Domain:
You can call upon the cold darkness between the stars to gain flight, travel to other worlds, or summon monsters from beyond to do your bidding
So I was thinking of a splash attack spell
Echo of the Void (Evil, Void) Level 4?
Close range 25' + 5'/2 Lvl
Components: V
Conjure a small sphere of dark nothingness and toss at opponents
20' burst/splash d4 + wisdom modifier/caster level of void energy dmg
SR Will Save (since its just energy)
I literally just whipped this up and I have no idea of balance. Does this have merit?
Any and all input is welcome. Ideally, I'd like to use it in a game this Saturday March 4th, but I won't hold my breath, lol.
Thank You all in advance!
I don't want it to be over powered, but significant enough to make my players concerned
If you have it Ultimate Magic had a good section on making custom spells. Link below to at least most of the relevant text.
http://legacy.aonprd.com/ultimatemagic/magic/designingSpells.html
Ok from there we need to pick what class its for. Given that you are referencing the void domain I assume cleric which generally has worse blast spells than arcane classes.
Based on your description the closest spell would be Flame Strike. Shorter range but no S component. Pathfinder doesn't add ability scores to spell damage so discarding that. I would say as a 5th level spell its fair dealing either 1d4 untyped/void damage OR 1d6 damage split evenly between cold and untyped/void damage. Your target area is a bit better than Flame Strike but not gamebreakingly so if you are restricting it to those with the domain. Either Evocation or Conjuration for spell school.
Echo of the Void
Conjuration[Evil, Void] Void 5
Casting Time: 1 Standard Action
Components: V, DF
Range: Close (25 +5/2lv)
Area: 20ft burst
Duration: Instantaneous
Save: Ref(half) SR: Yes
Deal 1d4/cl void damage to all creatures in the area. Creatures that make a successful reflex save take half damage.