Won on Covenant 2 with the Stygian Guard. I figured out they’re all about the spells so that’s what I emphasized. The holdover spell upgrade seems to be a big part of all my winning strategies so far. I used the Awoken as allies because I needed some tanks. Stygian units are really weak health-wise. So yay, 2 in a row, and now on to Covenant 3 and the Umbra which I just unlocked on that run.
As an aside, I wonder why they didn’t name this “Hell Train” instead of what they named it. Especially since it’s a … hell train. The name actually kind of put me off from paying much attention to the game at first. I’m sure they thought about naming it ‘hell train’ though. Maybe they figured that having ‘hell’ in the title would offend some people (and if so, they would probably be correct).