All Resistances includes all of the damage types, including
dmg_physical (the code for
Physical Dmg). If you open the game's .exe file with a hex-editor and search for
dmg_ you can find all of the game's damage types. There's only one damage type that's no included in
resist_all (the code for
All Resistances), which is
dmg_special, but as far as I know it is not used by anyone (yet... *evil laugh*).
However, Luke Cage's
All Resistances passive does not work because the values are messed up, but other characters' (Deadpool's, Iron Man's etc) works. I will fix it in my upcoming Maegawa's Patch mod, along with many other unnoticed flaws... you can check details about it at
my workbench.
I don't know if it reduces precisely what it says, but I can assure you it
does decrease incoming damage...
About innate resistances, aside from the immunitites certain characters have, Ms. Marvel and Storm both have an innate 10% resistance to
dmg_elemental, which if I recall correctly includes
dmg_fire,
dmg_cold,
dmg_wind and
possibly dmg_electricity &
dmg_radiation.
Here you can find the tool to open most of the game's files.
Feel free to ask further questions regarding the game's coding, it's always a pleasure to help!