Myrmidon (5e Subclass)
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The myrmidon is a fighter subclass.
Relying on their training and will to survive, the myrmidon sacrifices their defence for powerful offensive capability. To be a myrmidon, however, calls for discipline despite the aggressive nature. To fall too deep into the lust for combat would make them no more than a barbarian.
When you take this subclass at 3rd level, you gain access to Determination. You have Determination points equal to your Fighter level + your Constitution Modifier. You can use these points fuel various abilities. When you spend a Determination point, it is unavailable until you finish a short or long rest, at the end of which you prepare for combat once more.
Determination Save DC = 8 + your proficiency bonus + your Strength modifier
Upon taking this subclass at 3rd level, you gain a bonus to your AC equal to half of your Constitution modifier (rounded up) so long as you are not wearing heavy armour.
Keep On Rolling
A myrmidon soon learns to survive the harshest of impacts and worst of obstacles. At level 7, the myrmidon can add their Constitution modifier to any roll involving a grapple, a shove, escaping a trap, or a Strength saving throw.
The myrmidon learns that hindsight is 20/20. Starting at the 10th level, with each successful attack roll against the Myrmidon, the Myrmidon gains a cumulative bonus to their AC of 1. This bonus resets upon ending a turn without having been hit by a successful attack roll during that turn.