Casting Time: Action , Range: 30 Feet , Components: V (Vocal) - M (Material) , Duration: Up to 1 Minuet (Concentration)
Special Material: an amethyst worth at least 100 gp
Effect
You attempt to entomb a creature in crystal. A Large or smaller creature of your choice within range is surrounded by purple light and must make a Dexterity saving throw. On a failed save, the light solidifies, encasing the target in a shard of purple crystal large enough to contain them until the spell ends or the crystal shatters. While encased, the creature suffers the effects of the petrified condition with the following changes: they have vulnerability to thunder damage and are trapped in crystal instead of turned to stone. An entombed creature can be targeted by attacks and spells as normal.
The crystal shatters if the entombed creature takes 10 or more damage, or if the crystal is moved more than 10 feet in a single turn.
At Higher Levels
When you cast this spell using a spell slot of 4th level or higher, the duration is concentration, up to 10 minutes. When you use a spell slot of 5th level or higher, the duration is 8 hours. When you use a spell slot of 7th level or higher, the duration is 24 hours. When you use a 9th-level spell slot, the spell lasts until dispelled. Using a spell slot of 5th level or higher grants a duration that doesn’t require concentration.
Lore, some nice lore flavour and/or history