Driven by the pursuit of knowledge and its scholars' worship of the Knowing Mentor, the Library of the Cobalt Soul is one of the best-respected and most heavily guarded repositories of tomes, history and information in all of Exandria. People from all lands come to the library to seek knowledge, and those particularly dedicated to the virtues of truth often pledge their minds and bodies to the Cobalt Soul's cause. To become a member of the Cobalt Soul is to give oneself over to a quest dedicated to unveiling life's mysteries, bringing light to the secrets of concealed evil, and guarding the most powerful and dangerous of truth from those whose unwholesome thirst for knowledge might bring death and suffering to others.

The monks of the Cobalt Soul are the embodiment of the maxim: "Know your enemy." Through tireless research, they steel themselves against the unrelenting tides of evil. Through rigorous training, they learn to break through their foes' mental and physical defenses. Then, once the fight is done, they record their findings for future generations of monks to study.

Source: Tal'Dorei Campaign Setting Reborn

Extract Aspects

Starting at 3rd level, you can strike pressure points to intuit crucial information about a foe. When your hit a creature with one of the attacks granted by your Flurry of Blows, you can analyze it. Whenever an analyzed creature misses you with an attack, you can immediately use your reaction to make an unarmed strike against that creature if it's within your reach. This benefit lasts until you finish a short or long rest.

Additionally, when you analyze a creature, you learn all of its damage vulnerabilities, damage resistances, damage immunities, and condition immunities.

Extort Truth

Starting at 6th level, you can precisely strike a hidden cluster of nerves on a creature, temporarily preventing it from masking its true thoughts and intent. When you hit a creature with an unarmed strike, you can spend 1 ki point to force it to make a Charisma saving throw. On a failed save, the creature is unable to speak a deliberate lie, and all Charisma checks directed at the creature are made with advantage for up to 10 minutes. You know if it succeeded or failed on its saving throw.

And 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.

If you wish to impose this effect on a creature without injuring it, you can attack the creature to simply touch it, dealing no damage on a hit.

Mystical Erudition

Also at 6th level, you have extensively studied the history and lore within the archives of the Cobalt Soul. You learn one language of your choice, and you gain proficiency with one of the following skills of your choice: Arcana, History, Investigation, Nature, or Religion. If you already have proficiency in one of the listed skills, you can instead choose to double your proficiency bonus for any ability check you make that uses the chosen skill.

You gain an additional language and an additional skill proficiency from the above list (or you can double the bonus of an existing proficiency from the list) at 11th and 17th level.

Mind of Mercury

Starting at 11th level, you've honed your awareness and reflexes through mental aptitude and pattern recognition. Once per turn, if you've already taken your reaction, you may spend 1 ki point to take an additional reaction. You can use only one reaction per triggering effect.

Debilitating Barrage

Upon reaching 17th level, you've gained the knowledge to manipulate a creature's ki to undermine their fortitude. When you hit a creature with an unarmed strike, you can spend 3 ki points to cause the creature to gain vulnerability to one damage type of your choice for 1 minute, or until the end of a turn in which it has taken damage of that type.

If a creature has resistance to the damage type you choose, this resistance is suppressed for 1 minute, rather than gaining vulnerability. A creature that is immune to the damage type you choose is unaffected. A creature who is affected by this feature cannot be affected by it again for 24 hours.