My, Firemagic's and Maslab's co-write is practically finished, and we need betas. Knowledge of Halo and/or Magical Girl Lyrical Nanoha is nice but not necessary. What is necessary is a strong stomach - the mission is slightly less than 70 pages long, and is rated M due to multiple instances of trivialised violence and torture.
It is already a GDoc, so just drop your mail here and I'll add you guys as commentators.