Elf Annihilator

Make a ranged spell attack. If successful, the target (If an elf) will be instantly vaporized, otherwise nothing happens. (Note: This spell is kinda a joke spell, but I want it for thematic reasons for my character. I have no idea how to balance spells, much less something this niche and powerful. Id like any suggestions for balancing as well as what level this spell should be. I also wanted to make an AOE version of this spell that would be a higher level spell. Any suggestions are welcome, thanks.)