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Thraxu blades are older than the thrax warrior culture that now wields them. The moiré pattern evident on close inspection of the (presumably inactive) sword's edge represent guides for programmable matter that (when the blade is energized) create a quantum virtual edge capable of cutting spacetime. Power packs for the ancient weapons are hard to come by, and so thrax knights wisely conserve their usage of high power settings.
Thraxu Blades use the rules for Nanoknives, below.
nanoknife (mandate archive: the dust) A general-purpose tool for disassembling solid objects, the nanoknife abandons sophisticated energy manipulation in favor of a very, very sharp edge. An inert knife may look like anything, but when triggered, a blade springs into existence between twelve and one hundred centimeters in length. Nanoknives never break or dull, and can chew through any postech material and most pretech ones with a minute of undisturbed carving. A nanoknife can operate for five minutes on one type A power cell.