Fellowship overhauls dungeon progression with a flexible new mode

Fellowship's latest update introduces an adventure mode intended to make early and mid-game progression less linear. Chief Rebel says the mode replaces the dungeon runner's league setup with a more flexible system. The studio aims to improve the new-player experience.
... No extra. Good. Potential issue: "dungeon runner's league setup" maybe source phrasing? We can say "dungeon runner league format" but summary says "dungeon runner's league setup". We can paraphrase. "league-based setup tied to the dungeon runner" maybe. Need not copy source phrasing. We used "dungeon runner's league setup" exactly? In expanded: "replacing the dungeon runner's league setup" is close to summary. Need original wording, never copying source phrasing. Better rephrase: "replacing the dungeon runner's league structure" still. Maybe "swapping out the league arrangement associated with the dungeon runner". Let's adjust. Also "adventure mode" is proper name, okay. "early and mid-game progression" maybe summary phrase. Could rephrase "progression during the early and middle stages". "new-player experience" rephrase "experience for newcomers". Good. Revised expanded: Fellowship's newest update adds an adventure mode aimed at progression during the early and middle stages. Th