When a group of former classmates gather for their ten-year reunion, old grudges resurface as old flames rekindle--and then things go straight to Hell. As a shower of comets brings an invasion of reunion-crashing undead, the surviving alumni must band together in this litRPG apocalypse filled with dark humor, horror, and loot cards!Join the survivors as they navigate a game of life, death, and more death, leveling skills and stats as a world-governing system urges them to struggle on for the sake of glorious battle.Welcome to Hell on Earth. Welcome to the Upgrade Apocalypse!Warning: This book contains apocalyptic adventures, creative cursing, jokes about the apocalypse, an interesting card skill system, horror monsters to fight or flee from, and character deaths when they fail their save throws.