
FedoraFerret |

HumbleGamer |
Stormborn Tyrn Your family’s homeland is subject to daily sandstorms and harsh winds on a normal day, and have thicker, stronger shells to prove it. You gain resistance to slashing damage equal to half your level (minimum 1).
This shouldn't exist.
You can give one elemental resistance, but not a physical one.
It is not balanced.

HumbleGamer |
It's half their level.
It is physical damage, not an occasional elemental one.
The fact it is half their level doesn’t matter.
We don't have a single ancestry giving physical resistance ( for good reasons ) and even barbarian rage has been nerfed ( most give 1 physical and 1 elemental/magical ).
Also we don't have any item which gives physical resistance, and the max we can afford is the armor specialization, which gives 1 ( or 2 if heavy ) +X specific physical resistance.
Where X stands foe the fundamental armor rune.
And the classes that unlock the armor specialization unlock it at medium lvls ( 7 for a champion, and 11 for a fighter )
Fundamental armor rune are
Lvl 5 +1
Lvl 11 +2
Lvl 18 +3
So
- it is better than a plate specialization at any lvl
- it allows some classes to get 2 physical resistances
- it triggers on many attacks. While a cold or fire resistance qould trigger once in a while.
- it is available earlier than barbarian rage resistance, it is always active and scales better.
From wherever we can look at it, it is always unbalanced.

FedoraFerret |

The fact that it isn't in first party does not make it unbalanced. PF2's design team made a decision. I acknowledge that decision, I respect it, but ultimately I disagree with it in terms of creating my own independent work.
Is it good? Absolutely. But I would put forward that it isn't because it's broken, but because plate specialization or rage are underpowered, given that, in my experience, higher level monsters are swinging for 30 damage a hit.

Talsharien |

I don't think this is broken at all. My game has just moved into chapter 6 of giantslayer (converted across to PF2) and each party member takes on average 30 damage from most attacks.
At 15th level, that would only be reducing the damage by 7 and both warriors in the group are often buffed with a 6th level stoneskin (DR 10 adamantine).
Once GM guide lands, I am sure Stoneskin magic items will be a thing to be constructed by crafting characters so really no inbalance here at all.
Nice work btw.