The Respawn Obelisk is a block added by Natura. The Obelisk is used to set the player's spawn point in dimensions that do not allow sleeping (like the Nether). To use it, place it in the world and right-click on it with an empty hand. It will set the player's spawn point to wherever they were standing. Breaking the Obelisk after doing this will return the player to the original spawn point for that dimension. If a spawn point has been set the block will light up.