uncommon attack earth evocation 

Cast [>>] somatic, verbal

Range 120 feet; Targets 1 creature

Duration 1 minute

You conjure a jagged lance of stone and then launch it at a foe. Make a spell attack roll against the target.

On a hit, you deal 6d6 piercing damage and the lance impales the creature, giving it a –10-foot circumstance penalty to its Speeds unless it Escapes. On a critical hit, if the creature is on the ground, the lance also embeds into the ground and immobilizes the creature until it Escapes. A creature that Escapes after being impaled takes 3 persistent bleed damage. When the spell ends, the lance crumbles into dirt, freeing the target if it hasn't Escaped.

Heightened (+1) Increase the damage by 2d6 and the persistent bleed damage for Escapes by 1.

Secrets of Magic, page 201.