I would take 6 piece Ancient Elf armor and support with Ancient White Dragon Sword, since it adds 15% to your damage.
I'd put Heaven's Justice at level 1, since it only does 1 hit, and the damage isn't very good.
HP Increase isn't that good, since it doesn't add much, and 340 won't last you long enough.
I find the little balls that home in on your enemies a bit too slow for my liking. They give some good airtime, but I rarely see a good use for using that.
Calling thunder does some good damage, and it's pretty easy to combo with, so I put points into it.
Lunia Skill Calculator(JP)
Hopefully this helps... considering you posted a week ago D: