Earthen Entrapment

Choose up to 3 Large or smaller creatures you can see within range that are standing on an area of rock, dirt, or similar earthen material at least the size of their creature size. The ground beneath their feet becomes loose and insubstantial, and the targets sink into it. The targets must each make a Strength saving throw or fall waist-deep into the earth, potentially bringing any objects that are held or carried with them. A creature never falls in such a way that it would cut off one of it's essential senses (An orc, for example, wouldn't fall in such a way that it's head or eyes were underground, preventing it from seeing or breathing). On a successful save, the target is unaffected. Creatures with a burrowing speed are immune to this spell.

Creatures trapped in the ground in this way are restrained, and for each creature, roll a d6 to determine its position in the ground.

1.  Both, or more than one, of the creatures limbs, aside from any below its waist, are restrained in the ground. Small items that the hand or arm is wearing or carrying are also restrained as well. Increase the DC for escaping this spell by 4. 

2.  One of the targets limbs, not including any beneath its waist, is also restrained in the ground. Small items that arm or hand is wearing or carrying are also restrained. Increase the DC for escaping this spell by 2. 

3-6.  No additional effect.

At the start of each of the creature's turns, the creature can make a Strength check against your spell save DC. If it succeeds, it is no longer restrained, and it pushes itself out of the ground. Additionally, if the caster of this spell loses concentration, all creatures restrained by the spell are immediately raised out of the ground in such a way as to not leave them prone.

At the DM's discretion, certain creatures with non-humanoid forms or bodies may be affected differently by this spell, if at all. 

At Higher Levels: When you cast this spell using a spell slot of 5th level or higher, you can choose one additional creature to be affected by the spell for every spell slot above 4th.