Chest and room rewards
Expand blueprint options in later biomes
Exploring later biomes broadens the chest rewards you can encounter, including blueprint opportunities.
Chest-bearing rooms in the Forest, Tower, and Dungeon once access to those biomes is available.
Chest exploration can be repeated on future runs. A specific blueprint is not guaranteed, and each discovered blueprint becomes part of progression rather than a recurring chest payout.
Switch away from blueprint hunting once the equipment options you need are available or the current biome is too dangerous to explore efficiently.
Open a guide to find other locations and see what the item is used for.
Exploring later biomes broadens the chest rewards you can encounter, including blueprint opportunities.