Legionary

When you choose this archetype at 3rd level, you gain proficiency in the Insight, Nature, or Survival skill (your choice).

Starting at 3rd level, you learn techniques and strategies for close-quarter combat. On your first attack each round, you gain a +1 bonus to the attack and damage rolls if at least one friendly creature is within 5 feet of you.

At 3rd level, at any point while moving on your turn, you can command a number of willing, friendly creatures within 5 feet of you up to your proficiency bonus to move with you. Each creature that chooses to move with you can use a reaction to move up to its speed alongside you, remaining within 5 feet of you while moving. This movement doesn't provoke opportunity attacks. You can use this feature a number of times equal to your proficiency bonus. You regain all expended uses of it when you finish a long rest.

Starting at 7th level, you learn better techniques and strategies for fighting closely alongside your allies. On your first attack each round, you gain a +1 bonus to the attack and damage rolls for each friendly creature within 5 feet of you, up to a maximum bonus equal to your proficiency bonus.
In addition, when you use your Action Surge feature, each friendly creature within 15 feet of you (except you) gains a +2 bonus to AC and to Dexterity saving throws for 1 minute.

At 10th level, when a friendly creature you can see is reduced to 0 hit points, you can use your reaction to move up to your speed toward it. This movement doesn't provoke opportunity attacks.

At 15th level, moving through a hostile creature's space is not difficult terrain for you, and you can move through a hostile creature's space even if it is only one size larger or smaller than you. As normal, you can't end your move in a hostile creature's space.

Starting at 18th level, when you use the Attack action and attack with a weapon while at least one friendly creature is within 5 feet of you, you can use a bonus action to make one additional attack with that weapon.