Shield Wall

2 or more same sized individuals with a shield equipped work together to protect each other. They both must have the same feat

Actions: 1 action to form ranks. 1 bonus action to break ranks

Effects: +2 to AC, +2 to strength save and checks movement speed is 15ft. Cannot dash

If order is called for a brace, individuals in formation can use a bonus action to drive the butt end of the pole arm into the ground. If an enemy enters your reach you get an opportunity attack dealing half damage. (UNLESS the enemy is mounted) if so attack deals double damage to mount.

 If a creature 1 size smaller is behind the shield wall they have full cover

If a creature of the same size is behind the shield wall the creatures have 3/4 cover

If a creature is one size larger they have half cover