Design a mutated boss zombie for a post-apocalyptic game, incorporating elements of grotesque mutation and monstrous proportions. This boss should feel like an overwhelming force, capable of striking fear into players. The creature's appearance should reflect the corruption caused by a failed cure, with bulging, pulsating growths and organic armor-like patches of mutated flesh. Incorporate sharp, jagged appendages, and give it an eerie, unnatural stance, like it’s been warped by the infection.