The Aether Legends DLC introduces a new realm in Minecraft, known as the Aether dimension, which cannot be integrated into existing worlds and spans 5,000 x 5,000 blocks. Players can access the Aether by constructing a portal using glowstone, a resource from the Nether. The Aether features challenges and threats, including three epic bosses: the Slider, the Valkyrie Queen, and Karthul.