I have done all the normal mode trials leading up to and including Castrum Marinum. Once complete, and all the other quests from the Resistance Officer, I went to the Warmachina Fanatic to see about unlocking extreme.

I haven't done any of them and picked emerald first. Went through the cut scenes but that didn't unlock the extreme version or didn't give it to me. I went ahead and tried the same for Cinder Drift and got the extreme version of that one.

Is Cinder Drift Extreme required to get Castrum Marinum Extreme?