Ranger

Beginning at 1st level, you have significant experience studying, tracking, hunting, and even talking to a certain type of enemy.

Choose a type of favored enemy: aberrations, beasts, celestials, constructs, dragons, elementals, fey, fiends, giants, monstrosities, oozes, plants, or undead. Alternatively, you can select two races of humanoid (such as gnolls and orcs) as favored enemies.

You have advantage on Wisdom (Survival) checks to track your favored enemies, as well as on Intelligence checks to recall information about them.

When you gain this feature, you also learn one language of your choice that is spoken by your favored enemies, if they speak one at all.

You choose one additional favored enemy, as well as an associated language, at 6th and 14th level. As you gain levels, your choices should reflect the types of monsters you have encountered on your adventures.

Beginning at 3rd level, you can use your action and expend one ranger spell slot to focus your awareness on the region around you. For 1 minute per level of the spell slot you expend, you can sense whether the following types of creatures are present within 1 mile of you (or within up to 6 miles if you are in your favored terrain): aberrations, celestials, dragons, elementals, fey, fiends, and undead. This feature doesn't reveal the creatures' location or number.

Beginning at 5th level, you can attack twice, instead of once, whenever you take the Attack action on your turn.

Starting at 10th level, you can spend 1 minute creating camouflage for yourself. You must have access to fresh mud, dirt, plants, soot, and other naturally occurring materials with which to create your camouflage.

Once you are camouflaged in this way, you can try to hide by pressing yourself up against a solid surface, such as a tree or wall, that is at least as tall and wide as you are. You gain a +10 bonus to Dexterity (Stealth) checks as long as you remain there without moving or taking actions. Once you move or take an action or a reaction, you must camouflage yourself again to gain this benefit.

Starting at 14th level, you can use the Hide action as a bonus action on your turn. Also, you can't be tracked by nonmagical means, unless you choose to leave a trail.

At 18th level, you gain preternatural senses that help you fight creatures you can't see. When you attack a creature you can't see, your inability to see it doesn't impose disadvantage on your attack rolls against it. You are also aware of the location of any invisible creature within 30 feet of you, provided that the creature isn't hidden from you and you aren't blinded or deafened.

At 20th level, you become an unparalleled hunter of your enemies. Once on each of your turns, you can add your Wisdom modifier to the attack roll or the damage roll of an attack you make against one of your favored enemies. You can choose to use this feature before or after the roll, but before any effects of the roll are applied.