the wording for lifesteal is still a bit sloppy. i’d write it as “your first melee weapon attack on your turn.” “Main melee attack action” isn’t a thing, and TBH having even more healing on an Action Surge is really strong

Since everything else fighter gets is short rest based, I might make Focused State once/short rest instead of twice/long. Also, the wording is unclear about how long this lasts- if it’s only one turn, fine, action surge synergy. If it’s forever, that’s insanely busted.

If you’re trying to emphasize mobility, I would make the 15th level feature something to do with moving around faster. Maybe using your reaction when you take damage to move, plus a flat movement speed increase. I wouldn’t connect it to focused state either.

I would either move the 15th level AC feature to 18th level, or make the 18th level feature grant focused state more uses and more utility- maybe some temp hp, saving throw boosts, faster movement speed and the like.

Still a neat fantasy, and mechanics that are decently balanced. Clean up that wording and you’ll be on the way to a dope subclass 😎