This spell is from the Dark Souls spell collection.

You emit the crystal breath of Seath the Scaleless. All targets in a 30-foot line must make a Dexterity saving throw. On a failed save, a target takes 2d10 force damage and 3d10 piercing damage and is petrified inside of a crystal, or half as much damage on a successful one and the target is not petrified.

A petrified target may make a Constitution saving throw at the start of every turn to break free.

Additionally, crystals grow along the ground on all unoccupied 5-foot-square areas affected by the spell. Each 5-foot-square crystal has AC 5 and 15 hit points. Reducing a crystal to 0 hit points destroys it. When a crystal is destroyed, it explodes, dealing 1d10 force damage and 2d10 piercing damage to all creatures in a 5-foot radius.