An End Crystal is a block added in the “End Update” in Minecraft, crafted and placed in the outer end islands. When activated, it fires a laser beam to the sky that is used to respawn the Ender Dragon or inflict damage on the Wither boss. An end crystal can be used to power respawn anchors to set spawn points in the End dimension.
End Crystals are important because they are the only way to respawn the Ender Dragon, the final boss of Minecraft. They are also used to power respawn anchors, which can be very useful for setting spawn points in the End dimension. End Crystals are also used to craft the End Gateway, which can be used to travel to the outer end islands.