There is, to my knowledge, no updated manual of any sort whatsoever.

The in-game "Hiergamenon" has been updated in many cases, there are still quite a few suboptimalities to be improved. This you can find in-game by clicking on the little ?-icon in the top-right of your screen.

It would be nice if the manual and Hiergamenon were updated at some point, in any case. Off the top of my head: a: how much damage does Tidal Wave do? Is it reduced by Defense or resistance in any way? b: I'm not aware of anywhere the tactical benefits of summoning are listed except after you have selected that Trait and can view them in a tactical battle. c: As per my other thread, I'm very unclear on the exact mechanism for checking the requirements of a Spell of Making victory, and in particular, what you have to do to stop the AI casting the Spell after it starts.