Eldritch Spirit Bomb

You gather the ambient magical energy from the surroundings and concentrate it into a massive sphere of crackling energy that surges around you, forming a pulsating orb of pure magical power.

Make a ranged spell attack with advantage against a creature within range. On a hit, the target takes 10d10 force damage. Additionally, each creature within a 15-foot radius of the target must make a Dexterity saving throw or take 10d10 force damage on a failed save, or half as much damage on a successful one.

Additionally, the Eldritch Spirit Bomb absorbs the life force of creatures slain by its power, empowering it further. For each creature that dies as a result of the Eldritch Spirit Bomb's damage, the spell's damage increases by 1d10, to a maximum of an additional 10d10.