Commander

This subclass is about emboldening your allies. The goal is to have a support/battlefield control fighter, or to have better party cohesion. It buffs allies via passive auras/commanding effects. It increases party damage output by allowing for extra attacks/actions for other party members.

Command

When you choose this archetype at 3rd level, you gain the Command Bonus Action.

Command- you can command an ally that you can see within 60 ft as a bonus action. A commanded creature can use an entire action immediately. Magic users may cast a spell, but it must be level 2 or lower, or allow an activated spell effect happen again. At level 10, the level of a spell that can be cast is raised to level 4, and at level 18, any spell can be cast. You can use this ability a number of times equal to your proficiency bonus until you take a short rest. 

Commanding Strike

7th. As part of your command bonus action, when an ally makes an attack roll on a creature as a result of being commanded by you, you may make an attack on that creature if you are within 5ft of that creature. This is usable an amount of times equal  to your proficiency bonus per long rest.

Distracting Presence

10th. While you are within 10ft of an ally, creatures that would attack that ally must make WIS saving throw equal to 8+prof+STR or DEX (your choice). If they succeed they are allowed to attack your ally, if they fail, they must attack you. At level 18, this aura increases to 15ft. 

Additionally, allies within 15ft of you may reroll failed concentration checks, and must take the new roll.

Focused Attacker

15th. When a creature that you have commanded makes an attack roll, you may activate this ability as a reaction to allow them to roll with advantage. If they hit, they deal an extra 1d12 damage, this damage increases to 2d12 at 18th level. You can use this feature a number of times equal to your proficiency bonus before taking a short rest.

Combat Preparedness and Coordinated Attack

18th

Combat Preparedness-  While within 15ft of your allies, you and your allies' Armor Class equal your armor class, unless theirs is higher. (in other words, allies with smaller ac come up to yours)

Coordinated Attack- When you use your action surge, allies within 15ft of you may use their reaction to use your action surge as well. 

Additionally, you and your allies have advantage on initiative rolls, while you can see eachother.