Dire Solitude

You target one creature within 60ft. It makes an Intelligence saving throw. If it fails the save, for one minute the creature's movement speed is halved, and it takes 1d8 necrotic damage at the start of each of it's turns if it doesn't have an ally within 5ft of it. It takes an additional 1d8 necrotic damage immediately after it uses it's action if it doesn't have an ally within 5ft of it. On a success, only its movement speed is halved is for one minute.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 1st.