Unimplemented Biomes

Tesla Biome

Initially, the Reign of Giants DLC was supposed to feature a Tesla Biome, but the idea was abandoned. It has purported concept art.^[1]

Includes:

Tesla Tree

Possibly based on this concept art
Tesla tree

Grotto biome

In the files of Don't Starve: Newhome, many files were found created in the style of Klei and at the same time with the prefix grotto, but not part of Don't Starve or Don't Starve Together. Judging by the modern style, they may have been originally designed for the "Return of Them" updates. Apparently it was supposed to be a cave biome.^{[Verification Needed]}

Includes:

Grotto Splash
Grotto Mowlth
Grotto Grub
Grotto Bug Lamp
Grotto Pillar
Grotto House
Grotto Grub Nest
Grotto Parnsip
Grotto Giant Parnsip

Lava Cave

Initially, instead of ruins, there were supposed to be Lava Caves. In them, you could get a lot of useful staves and lava rivers (which functionally worked like roads on the map). Willow's fire immunity would have been extremely useful for lava caves.^{[Verification Needed]}

Included: