Another of the three soldier friends Declan made in the army. She took over the troupe when the two field officers were killed and led the group back to the main branch of the army relatively safely with Bannon as support. She has since moved to Porthcaul as a guard and has been promoted to Captain. She lives there with Bannon, but hasn’t returned Declan’s latest letter. At the time of the writing, unbeknownst to Declan or Aldus, both Arka and Bannon had been reassigned to Garrison Black, Ciar’s Garrison, for insubordination. She was imprisoned for a time at Garrison Yellow where they tortured her for information but got nothing from her before Grisha rescues her and reunites her with Ciar.