Freya’s chariot was pulled not by horses but by two male cats. Both cats were described as being blue or grey and had been a gift from Thor. Why cats? Well, cats have been associated with femininity and fertility since ancient Egypt, so it isn’t surprising that cats would be associated with Freya in Norse mythology. But if Freya was the goddess of the feminine, why were her cats male? It may be that the association of Freya and these male cats represented a combination of female and male sexuality.

A Vitruvian is an Orokin recording device. One of these said devices plays a key role in The Sacrifice, containing recordings of Ballas detailing the creation of the Warframes, the Sentient's betrayal, and the Tenno.

The Orokin, also known as the Golden Lords or Makers by the Sentient and Golden Skymen by a now extinct colony on Mars, was an ancient civilization that ruled over the Origin System in the distant past. During what was known as the Orokin Era, they built technological masterpieces that surpass even present day technology while exercising complete dominion over the known world. Although details about the Orokin are scarce, they are almost entirely responsible for the current state of the Origin System.