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Returning is a mechanism by which a commander can instantly leave the current battle and magically travel back to his home citadel. There is a chance that he might get lost on his travels, return on a later turn or pick up the insane trait. The chance of becoming lost in the void is 7%1).
Returning can be triggered by the Returning or Vortex of Returning spell, or once someone with the effect of a Ritual of Returning or wearing a Ring of Returning get's injured.