A Blade of Caliban is an archaic sword, often but not always a Power Sword, commonly utilised by the Dark Angels Space Marine Chapter's elite Company Champions. Blades of Caliban are relics of the Chapter, and each has its own honourable heritage tracing back to the time of the Great Crusade when the I Legion rediscovered its Primarch, Lion El'Jonson, upon the now lost Death World of Caliban. Only the Champions of each company of the Dark Angels and their Unforgiven Successor Chapters, having performed a heroic and faultless duty, earn the right to wield one of these relic blades.
- Codex: Dark Angels (6th Edition), pp. 33, 47, 62, 82