Bone spikes

You cause spikes made of bone to grow from below a creature of your choice causing that creature to make a dexterity saving throw or be restrained by the piercing bones until the spell ends. A Large or larger creature has advantage on this saving throw. If the target succeeds on the save, the bones break and disintegrate away.

While restrained by this spell, the target takes 1d6 piercing damage at the start of each of its turns. A creature restrained by the bones or one that can touch the creature can use its action to make a Strength check against your spell save DC. On a success, the target is freed. 

At Higher Levels. If you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.