Leader of the legion

this is a fighter subclass that is able to both buff the rest of the party and go into the fray at the same time little weak on roleplay admittedly but I am still workshopping it but the point of this subclass is that 

heart

when you take this subclass at level three you gain your proficiency bonus plus one heart point's you may expend one heart point to choose to action surge or second wind and you may pick three other people within 60 feet who also gain the benefits note: they can choose either even if it is opposed to what you chose -if it is action surge they may lose the action surge bonus to temporarily move them next in the initiative order if two or more people both use this whoever has highest in dexterity will go next if your ally's use second wind they may choose to save it or use it using it immediately costs no action using it on their turn follows the same rules as regular second wind. two leaders of the legion can not restore each other's heart points and you may not use this on yourself. you can also use inspiration as a heart point. each time you gain an extra second wind use or action surge use you turn it into another heart point not including the first one of both

cephalopod courage

at 7th level, you may once per long rest choose to gain 1 d4 heart points as a free action in combat, for 24 hours after killing a creature bigger or with a higher challenge rating than your level you can expend a heart point to give yourself advantage on intimidation skill checks.

aura of determination

at 10th level, you are able to switch at your choice you can expend 1 heart point to make a 10ft radius in which all of your allies are immune to being frightened and when you use heart to either action surge or second wind instead of choosing 3 people all of your allies who are in the radius also benefit. 

fearsome strike

at 15th level, you gain proficiency in the intimidation skill if you don't already have it and you are able to expend a heart after you kill a creature and use the armour class the creature you killed as a DC for a wisdom save of three creatures who can see you and are within 60 feet and they are frightened until the end of your next turn.

indomitable force

at 18th level, you gain 3 extra heart points and you are also able to use indomitable the same way as second wind and action surge although you can only use it by expending a heart point and if you use aura of determination you are able to use all subclass features but in a radius now tripled to 30 ft.