Mine's basically a dark fantasy/cosmic horror at it's core, the embodiment of the abyss is trying to reconstruct itself from the previous armageddon and consume everything before the next. 3 main campaigns, the third being the sabotaged apocalypse where the players are the horsemen who are trying to complete the rebirth ritual before everything is absorbed into nothingness. Then there's planar mini campaigns against different cosmic entities somewhat aligned with the abyss, mostly just how each plane was corrupted by the eternal war with more emphasis on the behind the scenes factions. Because they only have minor roles in the main 3 campaigns.

The zombie ones are mostly just sandboxes in different settings, 3 initial faction choices civilian/infected/group trying to exploit the infection. Most of those are just notes on time scale and evolution/reactions to things etc.