Teklys' Trap Soul

A black beam of enervating energy springs from your finger toward a creature within range. Make a ranged spell attack against the target. On a hit deal 5d8 necrotic damage.

If the spell successfully brings the target to 0 hit points, the target is killed and it's soul is trapped inside of a newly formed Soul Gem that is formed from the the gem or stone that was used to cast the spell. A Soul Gem may only house 1 soul at a time. If the Soul Gem is broken within 10ft of the body that the trapped soul belongs, it may re-inhabit the soul's original body providing that the body has been considered dead for no more than 1 minute. 

Higher Level Casting: If the spell if cast at a higher level increase the damage by a further 2d8 per level above the 3rd.

History of the spell: This spell was originally created as part of a ritual, but was later adapted for more versatile means.