Loved this module since I got the Expert Rules box back in 86. When it got revived in the 5e playtest I had to give it a run. I dropped it into Eberron and I've been running it on and off since.
The game revolves around an ancient elven empire versus the uprising of demonic forces from Khyber...
This seems like a decent concept overall.
It might require a certain type of play, where actions are declared at the beginning of each round, which is good at reducing meta game combat.
I think the "Angry GM" has an article about rerolling initiative each round that could work well with this...