Minecraft Dungeons:Beacon

"GUIDING BEACONS – Your first task is to activate beacons that will reveal hidden walkways and lead you to the temple. You will find them to be heavily guarded by the Illagers."

- Guide to Minecraft Dungeons: A Handbook for Heroes

A beacon is a non-attackable entity that can be found within the various missions of Minecraft Dungeons.

Spawning

 * Missions

Interaction
Beacons need to be activated in order to progress through missions. they can do a multitude of things, like lift bridges, lower gates or trigger ambushes.