Hoplite

Hoplites are citizen soldiers armed with a shield (hoplon) and spear. They fight in formation called phalanx and they excel at fighting with comrades nearby. They are disadvantageous at fighting on open field with flanks exposed but they're masters at holding chokepoints.

Phalanx Formation

At 3rd level you learn how to fight in formation gaining advantage on strength saves against being pushed and how to protect allies around you, if they're 5ft from you they gain +1 AC. Your movement speed decrease by 10 ft .You also gain additional 5ft reach when you wield a spear or sarrisa

Will you stand?

At 7th level you achieved mastery in wielding your shield and polearm. You gain shieldbash-  If the target is a Medium or smaller creature, it must succeed on a DC 8 + proficency + str modifier  Strength saving throw or be knocked prone, and also lunging attack maneuver once per short rest.

Lunging Attack

Once per short rest increase your reach for that attack by 5 feet.

We'll fight in the shade

At 10th level you can masterfully catch blows and arrows on your shield. You gain Parry on Reaction that gives You +3 AC against melee and ranged attacks.

Parry

 You gain Parry on Reaction that gives You +3 AC against melee and ranged attacks.

Last One Standing

At 15th level you are a immovable object immune to being prone.

Hetairoi

You know that conquest can't be done alone that's why starting at 18th level every ally in 5 ft of you gain advantage to all their attack rolls.

Companion

Allies 5 ft from you gain advantage to their next attacks.