You see a guardian golem.
Notes
Its pieces can be used to generate a Hazard Golem.
They can be found during one of the tasks of The Cradle of Monsters Quest.
Abilities
Unknown.
Damage Taken From Elements
Physical 
Death 
Holy 
Ice 
Fire
Energy
Earth
Drown
Location
Behaviour
It moves slowly and fight in close range.
Strategy
Kill it to use its parts.