I think the Avatar of Wrath may be too weak. A turn after being spawned, he seemed to be destroyed or potentially disbanded. In comparison to the technology available at the time, he barely seems to stand a chance against a competent commander, I fear. And I had so been hoping to see havoc wrought.
Also, I'm curious, is there any possibility of a potential Apocalypse wonder causing either:
a) Some of the sea to dry up (and produce desert, perhaps?) which may be devestating for port towns and destructive for boats, of course
b) The land to flood?
Finally, I seem to be having trouble with Cure Disease. I use it on an empty tile and I seem to get an unselectable unit created. None of the stack of units are cured of disease and the option to give them any orders but move (or to use the quick-keys) doesn't work. Additionally, the tabs with the units in the stack has disappeared. If I move all the units off the tile, I have an invisible unit remaining that, if I select, crashes the game. Finally, if I save the game in the process of this, it becomes corrupted and it won't load. I'm sorry if I've done something wrong or if I've not explained clearly enough. I'd be happy to do whatever I can to be more helpful.