Shadow spider (Heart of Apocalypse)

The Shadow Spider is a shadow creature found in the 5th floor of the Stronghold of Security. It has the ability to drain prayer and they are unable to leave the dark mist. Although they don't drop anything, they can be used for combat training, since they give relatively high exp per kill and have a low defence thus can be killed very easily. Although it's prayer draining can become a hinderance for some players..