In order to hunt here you will need a strategy to deal with either Zombies (mages) or Ghosts (knights/paladins). It is advisable to just run them or if you get trapped use a stealth ring (Ghost and Zombies can't see invisibility).
On the first hunting floor you will meet: Gargoyles, Mummies, Ghosts, Crypt Shamblers, Demon Skeletons and Zombies.
On the last floor of the Upper Spike there are a lot of zombies to avoid.
If you are a mage, (Sorcerer/Druid) with level 30+ and have good economics, this is a great place to hunt with avalanche runes.