The Spider Den Key open Spider Den dungeon.
The Spider Den is an low-level dungeon designed for weak (level 5+) characters. Monsters have relatively low health and do not deal too much damage. However, enemy quantity in this dungeon is significant.
This dungeon is one of two sources of Healing Ichors and the main source of two weak untiered items: the Poison Fang Dagger and Spider’s Eye Ring.
Entrances to the Spider Den have a chance of dropping from Cyclops Gods, Ghost Kings, Urgles, Werelions and Undead Dwarf Warriors.
This dungeon must be completed to earn the ‘Tunnel Rat’ fame bonus.
The dungeon has a much more difficult version called The Crawling Depths.