Entropy Snare

You choose one limb of a creature to ensnare in pure entropy dealing 6d8 + 30 force damage or necrotic damage. They must then pass a constitution saving throw and upon failure the limb is taken over by the entropy, disfiguring it in some way determined by a d8.

1-3: The limb is reversed and weapon attacks made with the limb if it is an arm are all attacks made with disadvantage and you cannot satisfy somatic components and if it is a leg the creature's movement speed is cut in half. If the spell reduces the creature to zero hit points and they were to suffer this effect every part of their body is rapidly reversed, killing them instantly and all organs are ruptured.

4-5: The limb begins decomposing rapidly and will fall off in 3 turns unless a spell such as restoration or greater restoration is used. If it is an arm attacks are made with disadvantage and if it is a leg the creature's movement speed is cut in half. When the limb falls off and it is a leg the movement speed penalty changes to ⅓ of their movement speed. If the spell reduces the creature to zero hit points and they were to suffer from this effect their body rapidly decomposes and turns to dust in five turns.

6-7. The limb turns to sludge. If it was an arm it can be used to make an unarmed strike but cannot hold weapons and any held weapons in that hand are dropped the creature also can no longer satisfy somatic components. If it was a leg their movement speed is cut in half. If this spell reduces the creature to zero hit points and they were to have suffered from this effect they are rapidly turned to sludge while kept alive.

8. All entropy is taken from the limb and it will begin rapidly fading and disappear after two turns and the only way to recover the limb is via the wish spell. The limb loses all function immediately if this effect is what occurs. If the spell reduces the enemy to zero hit points and they were to suffer from this effect they rapidly fade from reality with the only way to restore them to life being the wish spell.