The Banishment

The Banishment
This catastrophic event that led to the opening of The Rift and the creation of The Lost Realms. The Banishment was the cataclysmic event that occurred when The Great Being banished The Underlyord into The Rift causing the destruction of the Humans, The Ether, and creating The Lost Realms, The Nether, and Wither Skeletons.

The full extent of the damage caused to Minecraft is still unknown.