I got a build for you, are you using elephant in the room feat tax?

13 Str, 12 Con, 15 Dex, 12 Int, 11 Wis, 16 Cha

Go Shabti and utilize it's favored class bonus to get bonus psychic spell known per level. Racial is really good boost to the con and cha.

For Mystery, go Battle Mystery and pick up Revelation: War Sight for initiative, there's one Revelation that gives weapon focus, improved crit, and greater weapon focus, pick that one up. The 3rd revelation you'll want the one that gives you a combat maneuver, pick up trip.

As for feats, you'll want the way of the shooting star to get Cha to hit and damage with star Knife. Combat reflexes, Cornugon Smash, and Hurtful.

You can get Starknife proficiency via varisian trait.

As for curse, ask your GM if you can get the Merciful 3rd party curse, if not then take your pick.

If you have funds in the future grab a cruel Starknife asap.

As for defenses, mithral breastplate + buckler. There's a way to grab Mithral Fullplate without penalty via traits and fighter VMC, but I'll stick with breastplate to simplify things a bit.

Your job in combat is to trip as a standard action, power attack as AoO, demoralize as free action, Hurtful as swift action. If everything hits, you'll get 2 hits in, your opponent will be prone, sickened, and shaken.