Strange Rock Defense

 is used as protection for the Strange Rock Heart. It is impossible to dig the block, however it is possible (but very difficult) to destroy it with Explosives. It will constantly move around in Strange Rock clusters of 3-8. If a Strange Rock Defense comes across an empty block of space within the Strange Rock, it will replace the rock as if the rock itself was regenerating. If the Strange Rock Heart gets destroyed, the Strange Rock Defense will stop moving.

Properties
Can suffocate a player if they come in contact with each other.

Location
Found around the strange rock moving around in clusters of 3-8.

In-Game Description
This thing seems impossible to dig.

Trivia
In each cluster of Strange Rock Defense, there is in fact 1 "leader" rock, and a few other that follow it around. If you destroy the followers with explosive, they will regenerate very fast. The only way to destroy the cluster is to destroy its leader (but they have the same sprite so you cannot spot it).