The 'Hermetic Order of Mars' promo card is a small but valuable addition for Terraforming Mars fans. Originally included in the Prelude 2 Kickstarter, it also appears in limited quantities at board game conventions. This automated card (no tags) requires oxygen to be at 4% or lower to activate — perfect for those early-game moments when every resource counts. Its effect? A sweet megacredit production boost (+2 steps) plus extra income of 1 M€ per empty area adjacent to your tiles on the board. Ideal for aggressive territorial expansion strategies, it can be a game-changer if timed right. Just watch out for its rarity — this gem might be hard to track down!