A bonesword is living organism, which has a small brain situated deep within its hilt and has a rudimentary sentience that allows it to gradually grow in length and repair any battle damage to itself and maintain a deadly monomolecular edge. However, it is completely slaved to the will of its wielder and is incapable of any independent thought. The weapon is made of chitin and constantly crackles with powerful psychic energy that flows along embedded nerve tendrils to create a psychic field around the blade, effectively creating a biological version of a force weapon. This energy amplifies in potency when in close proximity to another bonesword, such as when used in pairs. It is serrated on both edges and was originally a creature's massively elongated horn.
The bonesword can generate a powerful surge of psychic energy when stimulated by its user.
In 4th Edition, the bonesword's hilt, when stimulated by combat, can send out psychic pulses to nearby Tyranid creatures with the aims of whipping them into a killing frenzy. This ability is not present in the 5th Edition version.
- 1: Codex: Tyranids (5th Edition), pg. 83
- 2: Codex: Tyranids (4th Edition), pg. 31
- 3: Codex: Tyranids (2nd Edition), pg. 52
- 4: Bonesword