At first glance, this weapon appears to be an ornately fashioned shortsword. While in this form, the twin blade also acts just like a short sword in terms of damage and proficiency (for the purposes of weapon focus). However, as a move action the wielder can separate the sword into two thinblade swords. If the wielder makes a successful feint check when separating the swords, he may gain an additional attack with his off-hand at it's maximum attack bonus and does not invoke an attack of opportunity. Reattaching the swords requires a full round and does incur an attack of opportunity if within a threatened square.
Martial Light Melee
Critical 19-20/x2 - 18-20/x2
Range 5'
Piercing
Damage 1d6 - 1d4
Weight 2 lb
Cost 200 gold