OGC:Sentinel (5e Subclass)
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Martial subclass for a fighter: A wall to your back is just as good as another sword arm, for you excel where other warriors find their techniques hampered by a low ceiling or narrow hallway.
Beginning when you choose this subclass at 3rd level, you gain a +2 bonus to AC while adjacent to an ally or wall. Additionally, you gain advantage on checks made to avoid being disarmed, fall prone, or resist a shove while adjacent to a wall or an ally.
Starting at 7th level, you master a broad stride and adroit footwork that grants you an undeniable tactical mobility. While you benefit from the Flanked Defense feature, all adjacent allies gain a +1 bonus to AC. If you have the Protection Fighting Style, you may use it to benefit allies within 10 feet instead of 5 feet.
Additional Fighting Style
At 10th level, you can choose a second option from the Fighting Style class feature.
Back to the Wall
Beginning at 15th level, while within 5 feet of a wall you deal additional damage equal to your fighter level on your first attack each turn. While within 5 feet of a wall on two or more sides, you deal this damage on all attacks.
They Have My Back
Starting at 18th level, your allies are considered walls for the purpose of your Back to the Wall feature.