watch 02:46
The Quarry - The Loop
Do you like this video?
Play Sound

You see Stonecracker.
- HUAHAHA!
Notes
Appeared the first time with Summer Update 2008. He is a random spawn with no announcement.
Stonecracker on Unitera
Click Here to Show/Hide Spoiler Information
Spoiler warning: Quest and/or game spoiling details follow. (Settings: hidden content)
Part of the Killing in the Name of... Quest. The portal which leads to the boss is upstairs in west tunnel of the deepest floor of Cyclopolis (here).
Spoiler ends here.
Abilities
Damage Taken From Elements
Physical 

Death 

Holy 

Ice 

Fire 

Energy 

Earth 

Location
Stonecracker spawns near the stairs which lead to the Behemoth Quest room. It's also possible that it spawns after the level 30 door (as shown in the image) with 3 Behemoths. There were rumours at one time that it dropped Earthborn Titan Armor which appear to be false.
Behaviour
This boss behaves similar to a Behemoth, only with stronger attacks and the ability to heal itself.
Strategy
Fairly easy for a level 80 knight to block.