Minecraft Dungeons:Silverfish

The Silverfish is a hostile mob and previously an unused mob in Minecraft Dungeons. They first appeared in the Minecraft Dungeons Announcement trailer, where a few of them are seen in the first few seconds. They are also seen in the first few seconds of the Minecraft Dungeons: Cross-Platform Play Trailer. It was unknown before where they would spawn or how they would behave, but they would have most likely have spawned in underground locations like the Redstone Mines or the Fiery Forge. They also will appear in a stronghold level for the upcoming Echoing Void DLC.

Behavior
Silverfish behave very much the same as their counterparts from the original game with a new addition of dropping down from the ceiling, not taking damage, to swarm and overwhelm the player in their numbers.

Trivia

 * It is one of the few mobs first seen in promotional material that will finally be added to the game.
 * Another example being the Tropical Fish for Hidden Depths.