I just came across my first dungeon in Minecraft, and already the Mob Spawner is giving me problems. What would be a quick way to destroy the Spawner? All the Minecraft wiki mentioned was ways to trap mobs.
Minecraft – How should I destroy a Mob Spawner
minecraft-java-edition
Related Solutions
The rules for "normal" spawns do not seem to apply fully to Mob Spawners. A dungeon with a completely flooded floor is not safe. Apparently the random block in the 9x9x9 cube can be air.
Here's a flooded dungeon, and here's the same dungeon after I turned the difficulty to Easy (and removed the torch). The spider spawned in the water and climbed up to the ceiling.
Edit: Test repeated with source blocks, and a torch for better visibility.
Setup
Result: still not safe
I know this is an old question, but it came up in a Google.
It has recently been theorised (and to a certain extent proved) that there is a bug related to mobs spawning on the edge of the loaded chunk area, wandering out and still using up the mob limit.
Further analysis and experimentation is available in this video.
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Best Answer
To break one, use a pickaxe, preferably Iron level or higher. Note, once you destroy one, it will not drop as a block, so break these only if you'd like to get rid of them permanently.
While your opinion may differ, I find spawners to be excellent exp farms, and you can turn yours into a mob farm.
If you'd rather save your Mob Spawner, you need to block it off with light, similar to placing torches in a cave to ward off mob spawns. To de-activate a mob spawner, place torches around the spawner (at least an 8 block radius) to prevent mobs from spawning. Put them adjacent to the block itself.