House Arpexia was an Oldblood House that was one of the six ruling Houses during the War in Heaven. It was committed to reason, science, and a belief in objective truth, even after all other Houses had abandoned the concepts, and it was part of the House Military.

Arpexia was better than any other bloodline at producing deep-time strategies and technical devices such as experimental models of timeship and weapons systems like the babels; they were famous for their bottomless armoury. Arpexia's closest equal and strongest rival was House Xianthellipse.

Certain hypersensitive characteristics like night vision, a strong sense of magnetism, and hallucinatory hysterics were more common in members of House Arpexia than in the other Houses. (PROSE: The Book of the War)

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