Talon's Black Flames

You unleash a sweeping wave of black flames in a 30-foot cone. All creatures within the cone must make a Constitution saving throw. A creature takes 3d8 fire damage and 3d8 necrotic damage on a failed save or half as much on a successful one. Any creature who fails their saving throw is cursed for 1 minute, suffering disadvantage on attack rolls and ability checks as the lingering black flames weaken their resolve and strength. A creature cursed by this spell can repeat the saving throw at the end of each of its turns, ending the curse on itself on a success. A remove curse or dispel magic spell also ends the curse.

The flames cling to surfaces and remain as dark, flickering embers for the next minute, darkening bright light to dim light and dim light to darkness and imposing disadvantage on Wisdom (Perception) checks relying on sight. These magical flames can't be extinguished by nonmagical means.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the fire or the necrotic damage (your choice) increases by 1d8 for each slot level above 5th.