You can stab your enemies with your sword or another slashing weapon.
Benefit: Choose one kind of light or one-handed slashing weapon (such as the longsword). When wielding your chosen weapon one-handed, you can treat it as a one-handed piercing melee weapon for all feats and class abilities that require such a weapon (such as a swashbuckler’s or a duelist’s precise strike) and you can add your Dexterity modifier instead of your Strength modifier to that weapon’s damage. The weapon must be one appropriate for your size.
You do not gain this benefit while fighting with two weapons or using flurry of blows, or any time another hand is otherwise occupied.
What exactly does it mean that “You do not gain this benefit while fighting with two weapons or using flurry of blows, or any time another hand is otherwise occupied?” Can I use a shield? What about a buckler? Can I use flurry of blows? Brawler’s flurry? Two-weapon fighting? Spell combat? Attack with natural weapons? What if I throw the weapon? What about swordmaster’s flair?
Slashing Grace does not allow most shields, but bucklers work because they don’t occupy the hand. Flurry of blows, brawler’s flurry, two-weapon fighting, and spell combat all don’t work with Slashing Grace. Attacking with natural weapons beyond the weapon you chose for Slashing Grace also does not work. Slashing Grace only works with melee attacks, not thrown attacks with a melee weapon. Swordmaster’s flair should have a sentence added to it that says “Carrying a swordmaster’s flair counts as having that hand free for the purpose of abilities that require a free hand, though you still can’t hold another object in that hand.”
Pathfinder Roleplaying Game Advanced Class Guide © 2014, Paizo Inc.; Authors: Dennis Baker, Ross Byers, Jesse Benner, Savannah Broadway, Jason Bulmahn, Jim Groves, Tim Hitchcock, Tracy Hurley, Jonathan H. Keith, Will McCardell, Dale C. McCoy, Jr., Tom Phillips, Stephen Radney-MacFarland, Thomas M. Reid, Sean K Reynolds, Tork Shaw, Owen K.C. Stephens, and Russ Taylor.