With the forest shrouding us from sight and my spell diffusing our scent, we escaped the battlefield once more and made our way deep into the forest, where we could reorient ourselves and begin to search for where these monsters and undead are coming from.
It stands to reason that there are places that they gather - at the very least, anyways - before making there way out to base of the mountain to initiate the battle for the heart of this place.
If it isn't just a gathering spot, then perhaps some type of object that allows them to spawn again, or just a place that all the energy gathers to reform and regrow the monsters and undead, since the Marquess told us that they are technically the same monsters each time, just evolved to survive better.
Whew~