Graveyard

The graveyard is a new mini-biome added in the 1.4.0.1 update, created whenever there are at least six Tombstones in close enough proximity. They are marked by background effects including heavy fog, dulled colors, and even lightning when enough graves accumulate. Graveyards cause Ghosts to spawn, and also allow nighttime enemies such as Zombies and Demon Eyes to spawn during daytime.