Blazing Threads

Striking both palms down upon the ground, several immolated threads of arcana tethered together appear and snake along the ground towards three creatures the caster can see within range, as they coil tightly around their target's extremities and torso. The threads can travel over obstacles up to 20 feet high but cannot leave the ground as the thread breaks from lack of support (if a coiled creature moves above the ground this height limit also applies).

Each target must make a Dexterity saving throw or take 5d6 fire damage as they become coiled until the spell ends or they break free. On a successful save, the target takes half as much damage.

A coiled creature takes 2d6 fire damage at the start of each of their turns and must use 2 feet of their movement speed to move 1 foot. Furthermore, they reduce their damage from strength based attacks by 1d8. As an action, any creature can make a Strength (Athletics) check against your spell save DC, ending this effect early on a success.

At Higher Levels:

When you cast this spell using a spell slot of 5th level or higher, the overall damage dealt by the spell increases by 1d6 and reduces an addition 1d8 damage from strength based attacks for every 2 slot levels above 4th.