Necromancer power! I just read this in the update notes.

  • The minimum number of participants for the following Campaign Ops has been decreased from three to one.
    Brave Dawn I / Brave Dawn II / Brave Dawn III / Pit Spider I / Pit Spider II /
    Pit Spider III / Granite Rose I / Granite Rose II / Granite Rose III / By Light of Fire /
    Cut and Cauterize I / Cut and Cauterize II / Cut and Cauterize III
/hurray