You whisper words in a dead language at a creature you can see that has the ability to cast spells. They must succeed on a Wisdom saving throw. On a fail, their spellcasting abilities are weakened for a number of times equal to half your spellcasting class level. Their next spell attack is rolled with disadvantage; if it is a spell that requires a save, the creature targeted by your enemy’s spell rolls with advantage. For example, if a level 6 warlock casts this spell on an enemy and the enemy fails the save, the enemy has disadvantage on their next 3 spell attack rolls. On a success, their spellcasting abilities are unaffected and you take 1d8 points of necrotic damage.