Annihilate Soul

This spell unleashes magic that rips the soul from a living creature you can see.

The target takes 8d6 + 50 necrotic damage, or half damage if it makes a successful Constitution saving throw.

If the creature is reduced to 0 hit points after failing the saving throw against this spell, it dies and its soul shatters into 2d6 spirit shards that take up residence in random life forms in a 10-mile radius. The spirit shards prefer intelligent creatures over unintelligent ones.

The creatures that become hosts to these shards are unaware of their presence, but they can start having strange dreams and displaying odd habits picked up from the soul shard. Each shardbearer also gains proficiency in one random skill possessed by the original creature; if they already are proficient in the skill, they become expert in the skill, and if already expert, they gain advantage on all uses of that skill.

A wish spell can't restore the soul, but the spell reveals the location of the creatures that hold the spirit shards.

The original creature can’t be resurrected unless all bearers of shards are gathered into the same area before the resurrection magic is used; shard-bearers lose all benefits gained from the spirit shards at that time. If a shard-bearer dies, the spirit shard transfers to another creature within 10 miles.