Horde Building

A horde building is a random occurrence that spawns several waves of zombies when you break a block or walk into a vicinity of a building, you will get a notification in the chat that you have found one.
Horde building is determined by chunk, so it is possible to have a 3x3 large building to have 9 horde buildings.

• "You’ve encountered a horde building, zombies are showing up rapidly!"

This is the start of the waves of zombies. You can either choose to run away or fight.

Horde waves work based off how many zombies you kill. Once you kill one wave, the next wave will spawn. Keep in mind that you have to kill the zombies for it to count, killing them with barbed wire or lava will not count toward the next wave.

• “Zombies seem to be getting lesser in this building…”

This is about the halfway point of the total number of waves you will face for this horde building.

• “You don’t see any new zombies in this building anymore.”

The zombies have stopped spawning. Feel free to enter and clear it out.

Horde buildings do not go away after you defeat the horde. They only go quiet for a bit after you defeat the waves. If you return later for whatever reason, you will have to deal with the horde building again.