Mage-Slayer's Curse
3rd-level enchantment
- Casting Time: 1 action
- Range: 60 feet
- Components: V, S, M (a torn page from a spellbook)
- Duration: Concentration, up to 1 minute
You place a debilitating curse on a spellcaster within range. The target must succeed on a Wisdom saving throw or be cursed for the duration. While cursed, the target has disadvantage on ability checks using its spellcasting ability, and whenever it casts a spell, it must roll a d20. On a roll of 5 or lower, the spell fails and the spell slot is wasted.
Additionally, whenever the cursed creature casts a spell, it takes 1d8 psychic damage per level of the spell cast.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the duration increases to 10 minutes. At 5th level or higher, the duration increases to 1 hour. At 7th level or higher, the spell doesn't require concentration.