Base Class: Ranger
Warning this is completely test material as it highly depends on the DM to come up with the amounts of knowledge you need to use this classes features.
Hunter’s Knowledge
At 3rd level, you gain the ability to add 1d6 damage depending on you're understanding of the creature you're fighting this damage increases to 2d6 at 7th level and 3d6 at 11th level.
When you're knowledge of the creature surpasses 33% increase the damage die to a d8 then at 66% to a d10 and at 100% to a d12.
Catalogue
At 3rd level, you gain the ability to catalog some findings you've gathered throughout the day equal to you're wisdom modifier in a book. This book houses all you're knowledge on every creature you have faced. Losing this book can revert your advancement on certain creatures. Knowledge of creatures of your favored enemy type does not get lost.
Morbid Curiosity
At 7th level, you gain the ability to dissect a recently deceased corpse to learn extra knowledge. This is possible through a medicine check and depending on the result can give up to triple the amount of knowledge gained.
You are also able to attempt to dissect a living creature however if during the dissecting a vital organ is struck you lose halve of the knowledge gain thus far.
Choice Judgement
At 11th level, you gain one of the following features of your choice.
Pinpoint
You can use your action to make a ranged attack against any number of creatures within 10 feet of a point you can see within your weapon’s range. You gain advantage on the attack rolls if the creatures you target have been cataloged to a total of 50%.
Text Book Teachings
When using the attack action against a creature you have cataloged you may add your wisdom modifier to the damage and attack rolls.
Archivit’s Defense
At 15th level, you gain one of the following features of your choice.
Evasion
When you are subjected to an effect, such as a red dragon’s fiery breath or a lightning bolt spell, that allows you to make a Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail.
Uncanny Dodge
When an attacker that you can see hits you with an attack, you can use your reaction to halve the attack’s damage against you.
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