Electric Chains

Weaving a chain, you create several loops of pure energy that wrap around a creature in range, binding them to the ground. The creature must make a Strength saving throw against your spell save DC or be restrained for the duration and take 2d8 Lightning damage, or half damage if it succeeds. The creature must make a Constitution saving throw at the start of each of its turns if it failed, taking 2d8 lightning damage on a failed save and half as much damage on a successful one. As an action, the creature can make a Strength check against your spell save DC to break free of the entangling chains, ending all effects on itself with a success. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 4th.