1-level Conjuration
You cause a multitude of ribbon-like shadows to instantaneously explode outward in a 5 foot radius sphere from a point that you choose, restraining nearby creatures. Each creature within the radius must succeed on a Constitution saving throw, or be restrained until the end of your next turn. The shadows vanish once they are no longer restraining a given creature.
When you cast this spell using a spell slot of 2nd level or higher, you can increase the radius of the sphere by 5 feet for each slot level above 1st.