Arcanologist

Level 3: Study the magical
You become skilled at detecting the magical properties of creatures. By using a Bonus Action you can learn one of the following:

• One Ability Score
• Spell Attack bonus or Spell Save DC
• A spell or magical ability available to the creature
• Saving Throw Proficiency
• Damage vulnerabilities, immunity or resistances
• Condition immunity
• Special feature

You can spend 1 hour to dissect the remains of a magical creature or study anatomical texts to learn all of its properties. Once you understand its properties creatures of the same family you can ignore Damage Resistances and Damage Immunity becomes Resistance.

Level 3: Arcana proficiency
You gain Proficiency in Arcana or if you already have Proficiency you gain Expertise instead.

Level 7: Instructor
You use your Reaction to give yourself or an ally that can hear you a bonus to Attack Rolls or Saving Throws equal to your Wisdom Modifier against a creature you've studied.

Level 13: Superior Study
You now learn 3 attributes when you use Study the magical on a creature.

Level 17: Perfect Study
You learn all attributes of the creature when you use Study the magical and the creature become Studied. You ignore its Damage Resistances and their Damage Immunity becomes Resistance.