Crush

You select one creature you can see, within range. Altering the weight of their body and driving them into the ground. The creature you targeted with this spell must succeed on a strength saving throw or take 1d8 force damage, half damage on a successful save. In addition, for the duration of the spell the creature has it's movement speed cut in half.

You may use your action to deal another 1d8 damage to a creature already affected by this spell, no spell slot required.
A creature may use its action to reattempt the saving throw to end this spells affects.

At Higher Levels. When you cast this spell using a spell slot of 2nd or higher, the damage increases by 1d8 for each slot level above 1st.