You rapidly liquefy the ground into a deep, sucking mire.

Choose a point on the ground you can see, within range.   A 15‑foot‑Line starting on that point, laying any direction you choose becomes thick quicksand like, unstable mud.

Effects

• The area becomes difficult terrain.

• Every creature in the line as the spell is cast, must roll a Dex saving throw, DC the casters spell save DC. On a success nothing happens (but it's still difficult terrain),                              on a failure they're halted and speed is reduced to 0.

• Any creature that starts its turn in the area must succeed on a Strength saving throw DC the casters spell save DC or become / stay Restrained as the mud pulls them downward.

• A creature restrained by this spell can use its action to make a Strength (Athletics) check against your spell save DC, freeing itself on a success.

• Creatures that succeed on the initial save treat the area as difficult terrain but are not restrained.

• If a creature is prone when it enters the area or as its cast, it makes the saving throw with disadvantage.

• (Can not be upcast for additional effects)

• The mud will not fully swallow any creature small or larger.  They become restrained up to the waist depending on creature size.