Chromatic Rings

You create 3 rings of chromatic energy that last for 1 minute or until the spell ends. When cast this spell you choose acid, cold, fire, lightning, poison, or thunder for the type of all of the rings you create and choose creatures within 30 feet for the rings to target. You may choose a single target for up to 3 rings. A chosen creature must succeed on a Dexterity Saving throw or become restrained by a ring, making this save with advantage if targeted by 1 ring, normally if targeted by 2 rings, or with disadvantage if targeted by 3 rings.

While restrained by this spell, the target takes 2d8 of the chosen damage type at the start of each of its turns per ring restraining it. A creature restrained by the ring or one that can touch the creature can use its action to make a Strength check against your Spell Save DC, taking 2d8 of the chosen damage type per ring. On a success, the target is freed from one ring. If the creature's Strength check totals above 25, all rings are broken and the the target is free.

Additionally, while concentrating on this spell you may spend an action to force one ring to implode, causing 4d8 of the chose type of damage to the restrained creature, and the ring is expended. 

At Higher Levels. When you cast this spell using a spell slot of 3rd or higher, the amount of ring you create increases by 1 for each slot level above the 2nd.