The Drain Edge is a beta item in the world of TOME. It can be equipped to an existing blade to upgrade it, giving the weapon an absorbing property. The Drain Edge can absorb enemy attacks in a form of data that can be released later as an attack. It can be discharged partially for a powerful shockwave, or can be discharged fully to release a powerful beam.
The capacity of the Drain Edge is considerably massive. In Episode 9, the Drain Edge is capable of absorbing Zetto's overcharged Breaker Beam, and in Episode 10, the Drain Edge is capable of absorbing the entirety of the Forbidden Power. In Episode 12, the contained Forbidden Power breaks free, splitting the Drain Edge in two.
The drain edge appears as an indigo-colored sliver of metal. When it is equipped to an existing blade, it covers the front of it. The design of it seems to exactly match Nylocke's sword.
Towards the end of Episode 11, as the players are warped up to HOME, the beam of light that teleports them knocks the Drain Edge off the statue, causing it to land on the ground.