Crippling Knowledge

You utter a string of confusing questions laced with arcane runes that reach into a creatures knowledge of it's most powerful assets.

The creature makes an intelligence saving throw. Upon failing, you gain knowledge of the creatures highest scoring ability (e.g strength, dexterity, wisdom), and impose disadvantage on all ability checks and saving throws using that ability. If the creature succeeds the saving throw, the spell does nothing.

If there are several abilities that this spell applies to, you become aware of all of them, but are only able to cause disadvantage on one of your choosing.