Venetian
Just like what Alex 'predicted', the world abruptly came to its end. Sudden outbreak of a plague, the dead rose from their graves, and if you think that was crazy then wait when they evolved into more menacing red zombies. The situation became even crazier when the black one came into the picture.
As the saying goes, what didn't kill you will make you stronger. Slowly but surely, humans adapted and overcame every trial thrown at them. The stronger the enemy they faced against, the stronger they became.
The doomsday pillars that appeared exactly on the hundredth days after the apocalypse gave hope that once again humanity would survive. At least that was the case, until the Tribulation arrived.
The tribulation days, the days when hell literally broke loose and announced its advent on Earth. Thousands of seemingly bottomless pits opened their maws and unleashed millions of abominations, flooding the planet with terror. Once again, humanity was under siege.