Aesop's Forceful Fisticuffs

When you activate this spell, two powerful arms made of vibrant arcane energy that appear on your back near around your shoulders, which can deliver powerfully fast punches imbued by your magic. You can use the arcane arms like functional limbs to make unarmed strikes equal to your proficiency bonus, using your spell attack modifier instead of your Strength modifier, with a reach of 5 feet into dealing 1d10 Force damage + your spellcasting modifier, after which the target must make a Strength saving throw or be knocked prone. Additionally for the duration, the caster will have advantage on Strength (Athletics) made using the additional arms.

At Higher Levels: If you cast this spell using a spell slot of 2nd level or higher you gain four arcane arms, increasing the unarmed strikes damage to 2d10 force damage. If you use a spell slot of 5th level or higher you gain 6 arcane arms, increasing the unarmed strikes damage to 3d10 force damage. If you use a spell slot of 7th level or higher you gain 8 arcane arms, increasing the unarmed strikes damage to 4d10 force damage. If you use a 9th level spell slot you gain 10 arms, increasing the unarmed strikes damage to 5d10 force damage and last until dispelled.