Call of the Grave

The caster chooses a place they can see. A swirling black vortex appears, with large spectral hands in the center. Any creature standing still within 15 feet of the vortex is pulled towards it, and any creature moving away within 15 feet has its speed halved. Any creature moving toward the vortex within 15 feet has their speed doubled. If a creature reaches the middle of the vortex, they take [roll]1d12[/roll] necrotic damage, and the spell ends.