The Hallow



The Hallow is a Hardmode surface biome. It is characterized by pastel-colored fairytale graphics, with cyan-colored grass, multicolored trees, and a large rainbow in the background, as well as similarly whimsical-looking (though dangerous) enemies. The Underground Hallow biome can be found directly beneath a naturally-generated Hallow biome.

The Hallow does not exist in newly-generated worlds. It is generated along with a large Underground Hallow biome when the Wall of Flesh is defeated for the first time and the world converts to Hardmode. Once generated, Hallow spreads in a manner similar to Corruption or Crimson. Pearlstone, Pearlsand, and dirt blocks growing Hallowed grass will spread Hallow to neighboring blocks, causing Hallow enemies to spawn over ever-larger areas. Hallow can also be seeded in new areas via Hallowed Seeds, Holy Water, or Blue Solution with the Clentaminator.

The Hallow is the only environment through which the Corruption and Crimson cannot spread at all, apart from the initial Hardmode conversion that takes place when the Wall of Flesh is defeated. Hallow also cannot spread through mud biomes like Jungles or Mushroom Biomes (unlike Corruption/Crimson, which can convert Mud into Dirt).

The Dryad can tell the player the percentage of Hallow and Corruption/Crimson in the world.

Spread
The Hallow spreads itself, similar to the evil biomes. This means that it slowly converts certain susceptible tiles that are in the vicinity of existing Hallowed blocks. While its spreading capabilities are very limited during pre-Hardmode, it spreads much faster and more aggressively after defeating the Wall of Flesh. Defeating Plantera for the first time reduces the speed of the Hallow's spread by 1/2 (50%).

Trivia

 * The word 'hallow' means "to make holy", meaning that the name Hallow likely means 'holy land.'

Hallowed Desert


When the Hallow spreads through desert, it becomes Hallowed Desert. It is very similar to the Hallow: the music theme is the same, the enemies are the same (except for the Light Mummy and Crystal Thresher), and the background is slightly different.

The sand is replaced by pearlsand. Although their color is different, cacti still drop cactus when cut, and waterleaves are also able to grow.

History
Das Heiligtum La Purification 神圣之地