Ok - Perhaps I'm being thick... But a Soulknife can (and must)
pick enhancements for their mind blade. There's a nice list with lvl
requirements before picking certain enhancements. I get all that. What
is not clear - can you have multiple enhancements on the mind blade at
the same time? (i.e. a Keen+Frost Burst+Mindfeeder+Brilliant
Energy+Coup De Grace) When do you pick these enhancements? Once and only once? Every time you form the mind blade? RAW: A soulknife's mind blade improves as the character gains higher levels.
At 3rd level and every odd level thereafter, the mind blade gains a
cumulative +1 enhancement bonus that she may spend on an actual enhancement bonus or on weapon special abilities. A soulknife's level determines her maximum enhancement bonus (see Table: The Soulknife ). The soulknife may (and must, when her total enhancement is higher than her maximum bonus) apply any special ability from Table: Weapon Special Abilities instead of an enhancement bonus , as long as she meets the level requirements. A soulknife can choose any combination of weapon special abilities and/or enhancement bonus enhancement bonus before assigning any special abilities. If the soulknife shapes her mind blade into two items, the enhancement bonus of her mind blade (if any) is reduced by 1 (to a minimum of 0). If this would reduce the enhancement bonus
on the mind blades to 0 and weapon special abilities are applied, the
soulknife must reshape her mind blade to make the options valid. Both
mind blades have the same selection of enhancement bonus
that does not exceed the total allowed by the soulknife's level, but
she must assign at least a +1 and weapon special abilities (if any).
This penalty does not apply when using the Mind Shield blade skill. My build is Ninja 3/Soulknife7. Dwarf. Str 17, Dex 15, Con 15, Int 10, Wis 13, Cha 10 (before magic items to boost). Relevant feats: Vital Strike, Greater Psionic Weapon, Power Attack Relevant Blade skills: Powerful strike Check my math on this please. With
a 2-H mind blade and Powerful Strike, this build is capable of doing
4d6+Str Mod+Enhancement Mod+Sneak Attack (2d6)+Psychic Strike
(3d8)+Enhancement Frost (1d6) +Greater Psionic Weapon (4d6) on a single
hit. = 11d6+3d8+(6-variable) With Psychic meditation I could
recharge mind blade psychic strike as a move+swift action, standard
attack, and ninja vanish as a swift action. Then repeat that gruesome sneak attack combo. If all this is true - wow. That's fairly powerful.