gnappeur's page

think katana with Shizuru divinity
katana is like a bastard sword but 1d8 with 18/20*2
in owersize you go 2d6 two handed

for blade
http://www.d20pfsrd.com/magic-items/wondrous-items/wondrous-items/r-z/scabb ard-of-keen-edges
this one is better that keen enchantement
perhaps a weapon mastery feat

PFS Legal Two-Handed Weapon Tricks

Source Weapon Master's Handbook pg. 9
These weapon tricks are known to dwarves of the Five Kings Mountains and Shoanti champions of the Cinderlands. You can use these tricks while wielding any two-handed weapon.

Cleaving Smash (Cleave, Improved Vital Strike, Power Attack): When you use Cleave, you can add the additional damage from Vital Strike to both your initial and your secondary attacks. If you also have the Greater Vital Strike feat, you can instead add the damage from Improved Vital Strike to both your initial and your secondary attacks.

And with this, cleave is great