Death's Grasping Hand

This dark and chilling spell allows the caster to summon a skeletal hand with spectral tendrils of frost to emerge from the ground under a creatures(s) within a 5ft radius, grappling a inflicting chilling frost damage. The tendrils are not only physically restraining but also sap the warmth and vitality of the creature, leaving the momentarily weakened. The creature must make STR save or be grappled and will take 1D10 Necrotic damage and 1D4 of frost damage. Creature cannot regain health points until end of your next turn. If creature saves, it is not grappled and takes half damage. 

Spell can be cast at higher levels: Damage increases at level 5 by 1D10 (2d10)  and 1D4 (2d4), level 11 by 3D10 and 3D4, level 17 by  4d10 and 4d4.