Crimson Periastron Mu’s description is inconsistent with that of the rest of the series it belongs to, saying “This sword is meant to” at the beginning of it, when it should say “The sword men use to”
Originally, Mu had the description “This sword men use to fight angry narwhals… in space.”, a typo’d version of the consistent description. Sometime a few years later this was changed to the one currently seen, assumedly by someone unaware of the series’ history.
Viewing any other periastron, such as the Ivory Periastron or Festive Periastron Chi, you can see they all start with “The sword men use to”.
The correct description for Mu would therein be “The sword men use to fight angry narwhals… in space.”