Rock Spiders are small spider-legged stones and they were added to The Binding of Isaac: Repentance. They behave very closely to 
Spiders, but they are exclusive to 
Mines and 
Ashpit and skitter at a slower speed
Upon death, they turn into a normal Spider.
Variants
Tinted Rock Spider
Tinted Rock Spiders are similar to Rock Spiders, however they have nearly twice as much health and move much faster. When killed, instead of transforming into a regular Spider, they drop 1 
Soul Heart upon death. They are characterized by the "X" on their rock, which is similar to Tinted Rocks.
They do not spawn naturally; there is a chance that 1-2 will spawn upon destruction of a Tinted Rock while in the Mines or Ashpit.
Coal Spider
Coal Spiders behave very closely to Rock Spiders, but they skitter at a faster speed due to being on fire.
Upon death, it leaves a hot rock on the ground that despawns after several seconds. They can be shot to make them despawn faster.
Rock Spiders coming into contact with a 
Fire Place or fire spawned by items, such as 
Red Candle or 
Bird's Eye, turn into Coal Spiders.
Trivia
- The Rock Spider and all its variants originate from the Antibirth mod.
 The Binding of Isaac: Rebirth
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