Dire Flail Mind Blade( Complete Psionic, p. 49)
When you reshape your mind blade, you can change it into an exotic weapon: a dire flail.
Ability to generate a mind blade, shape mind blade class feature,
Any time you wish to reshape your mind blade using your shape mind blade class feature, you can add the dire flail to your shape repertoire. You are proficient with your dire flail mind blade--you are treated as if you possess the feat Exotic Weapon Proficiency (dire flail mind blade). The weapon is sized appropriately for you and deals damage as a dire flail.