Durability of cartomancer / card caster cards

[Kapman]

OK, so normally when you use the deadly dealer feat, you destroy the card you threw, as though it were ammunition. However, for the cartomancer, The cards do not get destroyed and instead gain returning. However, questions come up as to the durability of the card in regards to sunder and damaging an unattended item. Additionally, my GM has allowed the cards to be made out of mithral, as it is, in theory, super ductile. Everything in the system measures durability (Hp) by inch of thickness. How does that work for individual cards? Is it just if they get past the hardness they break? Also, it says if a single card is missing, the deck cannot be used to commune with the patron. That seems like an awful risk for what will likely be a primary weapon.

Thoughts? Rules calls?

[Lost In Limbo]

I've had a look around and couldn't find anything on the hp of very thin objects so I'm jumping into some speculation and house rules here, be warned.

I would probably say that any object that isn't broken has to have at least 1 hp. After that is where it gets tricky. Does a mithril card also have 1 hp because of it's extreme thinness, or does it have 15 since mithril has 15x more hp than paper of the same thickness? Or maybe it's somewhere in between.

As for the issue of throwing around what is essentially your spellbook, nothing says you can only have one deck. I would have a ritual deck and a battle deck, one attuned to contact my patron and the other for throwing at people's faces.

[Qaianna]

Sunder might take the whole deck into account if you're holding it. Whether your hand would provide some more DR is up to your GM. And how you feel about using your fingers to protect your deck.

For a single card? I think I'd go with 1HP too. Aluminium foil can still be split easily once you get past its hardness, and some folks colloquially equate mithral with aluminium to begin with. So an individual mithral card would have ... paperlike hit points. But a whole deck would be harder to dent.

[Keith Apperson]

On part of your question -

My Card Caster Magus (and soon my Unwritten Occultist Arcanist with Harrowed/Harrowed Summoning) carries 2 decks - one for weapon purposes, one for divination. They aren't THAT expensive beyond 1st level.