Blackbird Clan Member Sherry:
The Command Post is on the 3rd floor of the Atelia Fortress. Burnstein is the leader, and it is said that he comes out from time to time to train the new recruits.
No one knows what's going on inside, and it's very difficult to go inside because you have to hold the gate when Commander Burnstein goes back inside the Command Post from outside.
Devianne has come all the way here, and is hiding near the entrance to the Command Post, to hold the gate open whenever Burnstein comes and goes back in.
If you are trying to go inside the Command Post, go find Devianne.