If your playing as an undead with PF -and- 3.5 content allowed, Might i suggest some feats?
Daunting Presence (Libris Mortis, Pg 25)
Death Master (Libris Mortis, Pg 26)
Eviscerator (Libris Mortis, pg 26)
Weapon Focus (Kukri most likely), (PfSRD)
Dazzling Display (PfSRD)
Shatter Defense (PfSRD)? ^_~
I currently play an undead binder with this feat combo, and works wonders for any role, be it stealthing/sneak attacking or tanking/melee dps. Whenever you crit, not only does the target get 2 stacks of shaken automatically (no save) from Death Master and Eviscerator, but all nearby enemies (allies of said target) within 30 feet get 1 stack of shaken as well (from eviscerator). But whats more is the target is now flat footed to your attacks until the very end of your next turn (but only to your attacks). Although in my binder's case, she also has a few auras that further nerf their saves and stack further fears on them, as well as intimidating strike from PHB2, so she essentially auto-panics things. But alternatively, such feats can be used to increase your damage output to a large degree thanks to sneak attack + shatter defense as well.
Course, this is only if you wish to be a fear/sneak attack machine, but it definitely would improve your odds of survival in a fight xD and send your dps through the roof.