I was reading Brings Life by Passing's flavor text and it says " Though Dead from the Calamity, the spirits of the dead still walk the old world."
I looked to see if there were any other Warpath spirits but DOD has most of the other spirit cards. It would be cool if maybe the spirits of the old world rise up to defend it from invaders. It could add lore about what the world was like before the Calamity i.e. Spirit of Blah, Great General. It would also give Warpath something else besides beast tribal. Anyway just a thought.