I had some work done on a homebrew soul knife, and I found a great way to do it...
Implement/rituel...
soul shards (mind shards cause I called it a mind knife)
you have a rituel (like beast master gets raise compainon) that allows you to break down a weapon into componint then abosorbe them...you can have as many as you like of soul (mind) shards, but are limited to two +1 per tier abosorbed at one time...
1-10 3
11-20 4
21-30 5
The mind blade can look like any weapon, but always had +2 prof, and does Base damage 1d6 at heroic, 1d8 at paragon and 2d4 at epic...Minor action to form the mind blade, and choose one shard to duplicate.
example: I have a +1 Luck blade, a +3 magic, and a +2 duilist weapon as my crytals at 9th level...I could minor make any one of them, or minor to switch witch one was active.
They also had a class feature that added cha mod to damage with the mind blade as psycic damage...
I had a heroic feat to up the damage...so 1d8/1d10/2d6
I had a paragon feat to allow you to amalgam shards...
example: I have a +1 Luck blade, a +3 magic, and a +2 duilist weapon as my crytals at 9th level...I could minor make a +3 Luck blade or a +3 magic, or a +3 duilst...
I had a paragon feat that made it high crit
I had an epic feat that made it a free action to draw/change it
I had an epic feat that let you add the number of shard you had merged to damage with the blade
One of the at wills I desinge was more or less a basic attack...
weapon
Str Vs AC
special: if you are useing a mind blade it is instead Str Vs Will
1W+ str mod
up to 2w at 21st
this counts as a melee basic attack
at 1st, 15th and 25th I had dailys that had effects that augmented the blade for the rest of the encounter...like 1st was add 1d4 psu damage till end of encounter...15th was crit on 18+ till end of encounter and 25th was become brutal 1 till end of encounter...
(((((Down side...it was very mad as a striker. I had melee attack based on Str, Range (throw mind blade) off Dex, and Cha secondary. Everyone that saw the class felt that was the wrong way to go with it...Also by makeing all the attacks weapon attacks with a benfit/bonus if it was a soul/mind blade many thought it wa a trap choice)))))))
If I ever went back to it, I know I would fix alot, b ut the main thought runing through my mind is reworking for power points AND full displine powers both...could be cool