Klein Sword (3.5e Equipment)

A Klein sword is a specially crafted Klein bottle to be sharp. A Klein bottle is a one-surface object. The simplest versions need a minimum of four geometric planes to exist in, of which, one of the planes needs to be only two layers deep. For the Klein sword, this is the plane you are in and a transitive plane, in the order of the Ethereal Plane, the Plane of Shadow, and finally the Astral Plane. Because of this, a Klein sword may attack an ethereal creature as if it had the ghost touch ability if it on any of these planes.

A Klein sword will not go through a portal unless it exists on both planes it is in. If the sword is taken to a plane without a corresponding transitive plane, its maximum HP and Hardness both change to 1.

Because of the odd shape, a Klein sword gives a +2 bonus on disarm attempts.