All Dark Matter Tools have a maximum of Two Charge Levels.
An unbreakable weapon of death-dealing made of Dark Matter, the Dark Matter sword has a base damage of 6 hearts. It has only one special effect that can be activated when charged (the charging damage bonus one got removed, confirmed):
1) If not used directly against a mob, the alchemist may use right-click or the R key to use a powerful area-of-effect slash, decimating any living (or undead) creatures in the vicinity by a slightly less devastating attack (but still substantially more powerful than a normal swing). The area of effect and the diminished damage bonus are also determined by charge level.
Each time you activate the force field of death (the area of effect), it consumes 1 glowstone dust.