Mentor

Warriors can be self-taught at times, but it is much more likely for one to have been taught the rules of battle. Those who teach the art of war are Mentors. Be it a wise old veteran out to find their final battle, a prodigy who wishes to train their potential rival, or a soldier who wishes to attune for their mistakes, these fighters fuse the thrill of battle with hard-learned lessons.

Eyes for Potential

Upon taking this archetype at 3rd level, you gain proficiency in the Insight and Perception skill.

Guided Blows

At 3rd level, you can provide guidance to your allies in combat. When you hit a creature, you can spend your bonus action and choose a friendly creature other than you within 60 feet of you. They have advantage on their next attack roll against the creature you hit.

Teacher of War

Also at 3rd level, you excel at demonstrate how to use certain weapons. Upon finishing a long rest, choose a number of other creatures equal to your proficiency bonus, that you can see. Each creature gains proficiency in two weapons of your choice that are on your person, and can instead use your Wisdom modifier for their attack and damage rolls with these weapons. If they already had proficiency one of the weapons, they instead add your Wisdom modifier to their damage rolls with said weapon once per turn.

You can also use your Wisdom modifier on attack rolls with these weapons.

You can change these proficiencies and the affected creatures at the end of each of your long rests.

Do it for Them

At 7th level, the sight of your pupils empowers you to keep fighting. When using your Second Wind feature, you can do one of the following, so long as you can see or hear a friendly creature within 30 feet of you:

Any friendly creatures within 15 feet of you gain temporary hit points equal to the amount of hit points you regained.
You can reroll and take the highest of the two rolls.

Expert Knowledge

At 10th level, you gain proficiency in two skills of your choice. Choose two skills of which you are proficient. Your proficiency bonus is doubled for any ability check you make that uses these proficiencies.

Additionally, when you would grant creatures proficiencies in weapons through your Teacher of War feature, you can also grant them proficiency in a skill of your choice. They can use your Wisdom modifier, rather than their designated skill's modifier, when using that skill. This proficiency must be with a skill you are proficient with.

Watch Me

At 15th level, not even death will stop you from guiding your allies to victory. When using your Indomitable feature, friendly creatures within 30 feet have advantage on the next saving throw they make in the next minute. If you succeed this roll, this range increases to 90 feet.

The Teacher is now the Student

At 18th level, you can learn a thing or two from your students. When using your Teachers of War feature, you gain the following benefits based on what classes (if any) your chosen creatures have:

Bard, Cleric, Druid, Sorcerer, Warlock, or Wizard. You learn one spell of 5th level or lower from one of the creatures, which must be a spell they know or have prepared. You can cast this spell once, using their spell save DC and spellcasting ability.
Artificer, Paladin, or Ranger. Once per turn, you either have advantage on one attack of your choice, or you deal an extra 2d8 damage on a attack of your choice.
Barbarian, Fighter, Monk, or Rogue. You have advantage on Strength, Dexterity, or Constitution checks and saving throws (your choice).