The Hive Scum class in the Warhammer 40,000 universe is a formidable ranged class, initially deemed the most powerful before adjustments were made to its capabilities. It features enhanced dodges, melee immunity while sliding, and immunity to ranged critical hits. A key ability, Enhanced Desperado, allows players to become immune to all ranged attacks, gain increased sprint speed, and reload without consuming ammo, although its cooldown has been adjusted from 30 to 45 seconds. The class also has strong melee combat potential and support capabilities through abilities like Stimm Supply, which provides team-wide benefits. Each character can access a 'Stimm Lab' tree with various stimm options that have specific effects and cooldowns. The class includes customizable cosmetics reflecting different gangs from Tertium, though these designs are criticized for being basic and generic. Overall, the Hive Scum class offers significant build potential and mobility, contributing to an engaging gameplay experience.