Yeah, the AI disbands heroes first when it runs high on unit maintenance (easy for the mercurians to do). That will be fixes in 0.21.
Cool, I thought I might be going crazy. I cheated and added him back in with the World Builder to solve the problem.
Ive never seen that before. If you have a save (before you kill acheron) i'd like to see it.
Will attach it to this post when I get home. Do you want it just prior to me killing him, the auto save from the first turn, a save from close to when he spawned, etc.? I'll try and get whatever you want (I usually save pretty often).
Glad to actually contribute in some tiny way by reporting a bug no one else has seen (I actually read the other posts...). BTW, why can't my Great Prophet found the Song of Autumn?