The Totem of Void Undying is crafted with 2 chorus fruits, 2 eyes of ender, 2 emeralds and 1 totem of undying.
That's how the totem looks like.
You felt in the void? No problem! This totem can save you...
Use a Totem of Void Undying to cheat death when falling in the void
Since v2.0.0 the Void Totem is crafted with lapis lazuli instead of emeralds to match the void totem's color.
The Void Totem works with the Curios API.
If you fall in the void wearing this totem you will be teleported back to the surface.