Berserker Stance : Brawler Stance
Legendary : "Berserker Stance" becomes "Brawler Stance"
"BrawlerStance" : warrior abilities ignore weapon requirements, hit chance decreased by 3%, gain a 40% chance to receive half damage. "Pummel" becomes a 3 second stun.
Additionally, while unarmed, increases melee attack Speed by 20%, melee critical damage by 30% and reduces "Pummel" cooldown by 50%
I don't think I have seen a unarmed focused legendary mystic enchant yet.
It would be a nice addition. However I do not like your proposition. Why decreased hit chance, why 40% chance half damage received ? 20% attack speed buff ? How fast would you hit exactly ? Why increased critical damage ?
The pummel idea is nice, but obviously PVP or leveling focused.
I think reducing damage taken has no justifications, but you do need to enhance damage done in some way to compensate absence of weapon.
There could be inspiration for more mystic enchants from countless martial arts or artistic work like Hajime no ippo or Rocky.