https://en.wikipedia.org/wiki/Immortal:_The_Invisible_War
https://rpggeek.com/rpg/1774/immortal-the-invisible-war-1st-edition
It's a hot mess out of the box, but the core mechanics make good bones, and they integrate the rules into the lore in a way that makes metagaming hard (Or in character, anyways, for example at high perception, you can actually see stats)
Dogs are not great at grammar and punctuation. They are still good dogs.