Word of God

[QUOTE]
Boss Upgrades – The Strong Get Stronger!

Floor 1: Atlas [Small Lesser Beetle]

[...]

· ROOM UPGRADE: Larger room (50 mana, 30 impurities)

Bigger battlefield for more room to go around.
[/QUOTE]

—Source: https://forums.spacebattles.com/threads/i-woke-up-as-a-dungeon-now-what-dungeon-worm.620521/page-181#post-49877689
—Archive: https://web.archive.org/web/20220618235032/https://forums.spacebattles.com/threads/i-woke-up-as-a-dungeon-now-what-dungeon-worm.620521/19/reader/?post=50716294#post-49877689