A totem that prevents you from dying in the void.
Flying around in the end with your elytra and suddenly your elytra breaks? Playing SkyBlock and falling down while building? No Problem! Craft a Totem of Void Undying, put it in your main/-offhand, and you will be teleported back to the surface, when you fall in the void.
"A must-have for skyblock and modded modpacks!"