Nether Wart Island

 is an Island unlocked at. It spawns Obsidian, Soul Sand, and Nether Brick blocks/slabs/stairs. It can only be placed on the player's Private Island. Like other islands, the first one comes with a crystal:
 * Nether Wart Crystal - grows Nether Wart on any Soul Sand below.
 * Radius: 5

Obtaining
This item can be obtained by Crafting, trading or bidding in Auction House.