World of Warcraft's Cataclysm expansion was an incredibly transformative moment for Azeroth and its inhabitants, and the Cataclysm Classic release is giving players a chance to relive the era that passed almost 14 years ago. Although the most obvious changes Cataclysm brought were reshaped zones and all-new quests in Deathwing's wake, Cataclysm also came with plenty of other systemic changes to World of Warcraft's equipment, stats, talents, and more. In particular, the player guilds system was given a makeover with its own leveling system, perks, and guildwide achievements.