I always figured your 'natural' armor helped against war magic, LOL! Partially because I've always seen mages Imperils/Vuln their targets, and because everyone buffs to the fullest and throws on minor/major armor just to be sure. Now I'm told that natural AL which is affected by Armor Self/Imperil, is only for physical attacks. Imagine my surprise! I've honestly never tested this out because I don't own a mage character. But I could SWEAR I take more damage from being hit with Evisceration if I have Swordsman's Gift and Gossamer flesh cast on me from those Virindi Quidox.
So technically I could pester an Archfiend without Executor's blessing on, get Gossamer Flesh cast on me... and the war damage would be the same?