en.wikipedia.org/…/Immortal:_The_Invisible_War

rpggeek.com/…/immortal-the-invisible-war-1st-edit…

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)