For the little assassin in you.
Step 1: LCKp1
Step 2: LCKp2
Step 3: LCKp3
Step 4: LCKp3
If you want this knife for a bionicle, you'll skip this part.
Step 5: Lego Combat Knife Complete
As a step away from my usual gig I decided to make a knife, it's not very accurate but it's as accurate as I can get with the pieces I own.