Viscero's Blood Boil

The insides of a creature you can see within range start to heat up to an unbearable boil. The target must make a Constitution saving throw. It takes 8d8 fire damage on a failed save, or half as much damage on a successful one.

On a failed save, the target's blood continues to simmer for the duration of the spell. For that duration, It rolls a d6 and subtracts it from all Attacks, Checks or Saving throws that use either  Strength or Dexterity. At the end of each of its turns, the target can make a Constitution saving throw, the target takes 4d8 fire damage on a failed save, and the spell ends on a successful one. This spell has no effect on creatures without blood, such as constructs and most undead.

At Higher Levels: When you cast this spell using a spell slot of 6th level or higher, the damage increases by 3d8 for each slot level above 5th.