The expansion is the final content pack for Harebrained Schemes’ tactical turn-based game, focusing on a massive influx of classic BattleMechs and devastating new weapon systems. Released in late 2019, it rounds out the game's Season Pass by bridging the gap between original board game lore and modern digital strategy. Note that "CODEX" in this context usually refers to game releases or archival data, as there is no specific "Codex" edition of this DLC. The Return of Classic Steel
: A 45-ton fan favorite with jump jets that provide damage bonuses after movement. BATTLETECH Heavy Metal-CODEX
: A 20-ton light scout variant (FLE-15) built for speed and harassing maneuvers. The expansion is the final content pack for
: Often priced around $14.99–$19.99 outside of sales. BATTLETECH Heavy Metal The Return of Classic Steel : A 45-ton
Heavy Metal introduces that provide more flexible tactical choices in the MechLab:
: High-rate-of-fire and shotgun-style ballistic variants that provide more consistent damage and crit-seeking potential. Flashpoint Mini-Campaign
: 40-ton medium units; the Assassin (ASN-21) features an "Intercept System" designed to hunt light 'Mechs.