Vital Seed

You launch a seed that drains the life energy of nearby creatures. Make a ranged spell attack to embed a seed of energy into your target. If the target is willing, you automatically succeed. A successful attack embeds the seed, causing it to drain essence out of nearby creatures, dealing 2d12 void damage with a basic Fortitude save to all other creatures in a 15-foot emanation from the target.

The seed then erupts with vital energy—if the initial target is living, they recover Hit Points equal to twice the damage a single creature took from this spell; calculate these Hit Points using the creature that took the most damage. If the initial target is undead, it instead takes vitality damage equal to the amount a living creature would've healed.