Cerebral Leech

You plant an invisible, tiny leech on a creature within range. At the start of their turn, the creature must make an Intelligence saving throw or take 10 psychic damage, or half on a failed save. If you say the creature’s true name while casting the spell, they take double damage from this spell.

When a creature takes 20 damage from this spell, you can sense a creature’s thoughts slightly before they act upon them. You have advantage on saving throws the creature forces upon you and the creature has disadvantage on attack rolls against you until the spell ends.

The spell ends when you are further than 30 feet away from the creature at any time.