Boron-13 was a large red moon that was located near the Luvliner brothel. It was destroyed by the Lexx in order coerce Schlemmi into granting the crew free access to the brothel. It appeared only in Lexx 2.4 "Luvliner".

Although not acknowledged onscreen, it is presumably in the same solar system as Boron-7, the home world of Giggerota.

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