Way of the Cerulean Spirit

Beginning at 3rd level when choosing this tradition, when you pummel an opponent and connect with multiple pressure points, you can extract crucial information about your foe. Whenever you hit a single creature with two or more attacks in one round, you can spend 1 ki point to force the target to make a Constitution saving throw. On a failure, you learn one aspect about the creature of your choice: Creature Type, Armor Class, Senses, Highest Saving Throw Modifier, Lowest Saving Throw Modifier, Damage Vulnerabilities, Damage Resistances, Damage Immunities, or Condition Immunities.
Upon reaching 6th level, if the target fails their saving throw, you can choose two aspects to learn. This increases to three aspects at 11th level, and four aspects at 17th level.

Upon choosing this tradition at 3rd level, you’ve undergone extensive training with the Cerulean Spirit, allowing you to mystically recall information on history and lore from the monastery’s collected volumes. Whenever you make an Intelligence (Arcana), Intelligence (History), or Intelligence (Religion) check, you can spend 1 ki point to gain advantage on the roll.
In addition, you learn one language of your choice. You gain additional languages at 11th and 17th level.

At 6th level, you can hit a series of hidden nerves on a creature with precision, temporarily causing them to be unable to mask their true thoughts and intent. If you manage to hit a single creature with two or more attacks in one round, you can spend 2 ki points to force them to make a Charisma saving throw. You can choose to have these attacks deal no damage. On a failed save, the creature is unable to speak a deliberate lie for 1 minute. You know if they succeeded or failed on their saving throw.
An affected creature is aware of the effect and can thus avoid answering questions to which it would normally respond with a lie. Such a creature can be evasive in its answers as long as the effect lasts.

Starting at 6th level, you’ve honed your awareness and reflexes through mental aptitude and pattern recognition. You can take a number of additional reactions each round equal to your Intelligence modifier (minimum of 1), at the cost of 1 ki point per reaction beyond the first. You can only use one reaction per trigger.
In addition, whenever you make an Intelligence (Investigation) check, you can spend 1 ki point to gain advantage on the roll.

Beginning at 11th level, your quick mind and study of your foe allows you to use their failure to your advantage. If a creature misses you with an attack, you can immediately use your reaction to make a melee attack against that creature.

Upon reaching 17th level, you’ve gained the knowledge to temporarily alter and lower a creature’s fortitude by striking a series of pressure points. Whenever you hit a single creature with three or more attacks in one round, you can spend 3 ki points to give the creature disadvantage to their attack rolls until the end of your next turn, and they must make a Constitution saving throw. On a failure, the creature suffers vulnerability to a damage type of your choice for 1 minute, or until after they take any damage of that type.
Creatures with resistance or immunity to the chosen damage type do not suffer this vulnerability, which is revealed after the damage type is chosen. You can select the damage type from the following list: acid, bludgeoning, cold, fire, force, lightning, necrotic, piercing, poison, psychic, radiant, slashing, thunder.