Indeed, Seeks the Moon was an ally spirit originally, and went free after his summoner almost died after the main UB hive got breached. Together with Anne Ravenheart and some surviving Firewatch guys, they managed to get the nuke Ares had brought into the city to the building on Cermak where the bugs were setting up a new hive, and sent it in just before the bugs finished putting up a massive ward to protect themselves, trapping the explosion inside.
Ravenheart now has her own department at Ares, which is basically the Ares version of the X-Files. In other words, anything weird and freaky involving magic, spirits, or other such nastiness is the kind of thing she'll investigate.