So under "Starting Wealth" the PCs get 100 g.p. and that's elsewhere clarified to be for mundane items. For combat balance, magic items are off a set list, but it seems the meager 100 g.p. could imbalance issues, especially if the players know their PCs are Worldwound veterans (which they do).
In Golarion, what's mundane? So at one end we get items labeled as magic or alchemical items which use Resonance, both obviously not mundane. Items in the Core book that we also have in reality could be considered mundane. It seems the line gets a bit blurry in between though.
Like what about other alchemical items? We have the basics like Tinder Twigs & Sun Rods, which should have minimal combat effect and are generally considered mundane by most players. But same w/ Alchemist's Fire, which could then be put into the hands of an Alchemist for decent effect. Heck, with demon weaknesses many minor items have decent effects, especially if persistent. That's a lot of firepower available in that 100 g.p.
And special materials. Silver's mundane, so does that mean Cold Iron is? That could be a game changer too. And many players will know this.
And Holy Water?
So when I tell my players "mundane items only" what exactly am I saying to them? What guidelines should I give (given that this section of Doomsday Dawn wants well-calibrated combat results & I don't want to audit all their purchases)?