Shadowlands

The Shadowlands is a sinister location that permanently replaces the End when the Shadow Dragon is summoned.

Environment
The Shadowlands is one giant island, similar to the End, except it is surrounded by a liquid block that insta-kills non-armored players upon contact called nythril. The island itself has dark obsidian pillars that are much taller than the regular Ender pillars, which have their respective "shadow crystals" that are indestructible (but can be deactivated for 60 seconds upon a hit) and heal the Shadow Dragon. The island is 3x bigger than the End island. After defeating the Shadow Dragon, several different kinds of mobs will start spawning that match the region's theme.

Portal
When the Shadow Dragon is killed, it will leave behind a portal to go back to the Overworld; however, a portal that leads back to the Shadowlands is also spawned near the Player's bed/spawn point for if they wish to return there.

Voxrokrania

 * Main Article: Voxrokrania 

This side-dimension of the Shadowlands is accessible when the Player has slain the Shadow Dragon, 15 Cerysl, and has thrown a Sinister Shadow Key at a Shadow Pillar's crystal. Once done so, a portal to Voxrokrania will open up. This dimension is useful for its Shadow Arenas and its boss, the Sinister Voxrokaut.

Madolv

 * Main Article: Madolv 

This side-dimension of the Shadowlands is accessible when the Player has conquered at least 3 of the 5 Shadow Arenas and the Sinister Voxrokaut in Voxrokrania. Once done so, the Player must throw a Disastrous Shadow Key at a Voxrokaut in the Shadowlands, and a portal to Madolv will open up (while also killing the Voxrokaut). This dimension is useful for its two item-dropping bosses, the Madolv Guardian and the Neemakora, and the Madolv Markets that spawn within it offering even more useful items.

Bojkreg

 * Main Article: Bojkreg 

This side-dimension of the Shadowlands is accessible when the Player has conquered all 5 of the Shadow Arenas, the Sinister Voxrokaut, Madolv Guardian, and the Neemakora. Once done so, the Player must throw an Apocalyptic Shadow Key at a Haolin right before it is about to die, and the portal to Bojkreg will open up (while also killing the Haolin). Bojkreg is very dangerous for its sub-bosses, the Ytri Ghorr, Sinister Neemakora, The Shyster, and Iccurol, that lead up to the Shadowland's most dangerous final boss, Lord Haolel. This is a boss that, although provides many amazing items, is one of the most difficult bosses to defeat.

Mobs

 * Shadow Creeper
 * Cerysl
 * Voxrokaut
 * Sinister Vytl
 * Shadow Dragon (Boss)
 * Haolin*
 * Spawns after all 5 Shadow Arenas and side-dimension bosses of Voxrokrania and Madolv have been conquered

Blocks

 * Nythril (Liquid)
 * Dark Obsidian
 * Dark Stone