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Source:
Grim Hollow: Player's Guide, Pg 121
(3rd party)

if not using Sangromancy this spell is a Necromancy school

Casting Time: Action , Range: 60 Feet , Components: V (Vocal) - S (Somatic) - M (Material) , Duration: Up to 1 Minuet (Concentration)
Special Material: Flint & Steel

Effect

• A living creature you choose within range breaks out into a cold sweat and must make a Constitution saving throw. On a failure, the cold sweat breaks into fever as the creature’s skin becomes flushed and hot to the touch, and the creature takes 1d6 fire damage at the start of its next turn. On a success, the spell immediately ends.
  While the spell persists, you can use a reaction at the start of an affected creature’s turn to force the creature to take fire damage again, increasing by 1d6 each time. The creature can use its action to attempt to cool itself, allowing it to attempt the Constitution saving throw again. On a success, the creature’s fever breaks and the spell ends.

At Higher Levels

• When you cast this spell using a spell slot of 4th level or higher, the initial damage increases by 1d6 for each slot level above 3rd.

Lore, some nice lore flavour and/or history