Searing Pain

3rd-level Evocation
Casting Time: 1 action
Range: 30 feet
Components: VS
Duration: 1 hour

With a snap of your fingers, the target's blood boils. The creature must make a Constitution saving throw or suffer 3d10 fire damage. or half as much on a successful saving throw. If a creature fails this saving throw, their blood begins to boil, granting them disadvantage on attack rolls and ability checks for 1 hour. A creature immune to fire is unaffected by this ability.
If a spell or magic ability would remove the poisoned condition, it also removes this effect, such as Lay on Hands or lesser restoration.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 for each slot level above 3rd.

Source: Homebrew