Manshoon's xorn talons

Manshoon's xorn talons, also known as stony hands, was a conjuration spell that created a crescent-shaped area in front of the caster, where any creature passing through would be grabbed at or otherwise harassed by taloned, stone arms that erupted from the ground. It was developed by the Zhentarim wizard Manshoon.

Effects
The area created by xorn talons was in the shape of an outward-facing crescent moon, 12' (3.7 m) across at the center and 20' (6.1 m) at the 'horns'. During the spell's duration, whenever a person or creature traveled across the area were clawed by, grasped at and raked by stone talons that emerged from the ground beneath them. These appendages were unintelligent claws that resembled the three upper limbs of xorn from the Elemental Plane of Earth.

The talons could be destroyed by normal means, or by the spells stone to flesh and rock to mud and the duration of their existence could be lessened by a successful casting of dispel magic.

Casting
The spell had a verbal, somatic and material component of a single piece of xorn flesh, hide or bone.