Controversy is afoot in Middle-earth. Warner Bros., via a forum post, has revealed what it calls the “Market.” This is a new component in Middle-earth: Shadow of War that introduces microtransactions to the game.
The Market houses a variety of purchasable items intended to expand player options, including Loot Chests, War Chests, XP Boosts and Bundles. Warner Bros. breaks down what each item listed means in a Shadow of War context. Loot Chests generally contain gear for protagonist Talion. Gear (of course with rarity grading) will add abilities to Talion’s loadout in the form of weapons and armor. Loot Chests can also drop XP Boosts. War Chests contain additional Orc followers normally obtained through in-game means. Orcs can come with Training Orders, which are further customization options for player armies and add experience. XP Boosts are self-explanatory. Bundles are combinations of the above.
Market items can be bought with Mirian and Gold. Mirian is an in-game currency that can be earned through a variety of means through normal gameplay. Gold is purchasable with real money and can also be obtained through certain in-game milestones and community challenges. In the forum post, Warner Bros. implies spending gold nets items faster, likely meaning something along the lines of less gold being needed to make purchases than Mirian on equivalent items.
Warner Bros. also stresses the items you can find in Market purchases are also obtainable in-game without needing to spend money.
Source: WB Forums