Is this some kind of puzzle? Couldn't Volland comment on the battle? In principle, it's possible to have a terrain where the battle can be won (I haven't seen the map, so I can't say for sure).
If you want to see, look for me in the WT chat.
Right now, I have 7 fairies, 14 air elementals, and 4 water elementals against 2 wyverns.
