Parry I

Once per turn, may direct proficiency** of wielded weapon as an AC bonus versus one* attacker.  Attacker must be identified before any attack results are issued.

* If wielding two weapons, proficiency can be split between two attackers.  If wielding Quarterstaff can direct full proficiency at two attackers.

** If wielding a two handed or heavy weapon, verses a lighter weapon (including a versatile weapon being wielded two handed) or a medium sized creature or smaller, proficiency is halved (round up).