It's a "monster" from Crevice: Abyss. Normally, their purpose is to keep players out of the monster spawn point. The closer you get to them, the harder they hit and the more KB they cause.
The GM team has been putting them in locations that lots of low-level bots commonly go through, to kill them (the Guardians are unaffected by the bots' non-aggro apparently). I would guess that a GM put one near 0,0 to kill any low level hackers map-hacking. BTW, the Guardians are basicly statues, and they are indestructible, period.
You may also notice a large group of monsters seemingly attacking empty air in Python. Again, this is the GM team getting creative in fighting bots and hackers. All the attacks of the monsters are AOEs, and their AI is being server-controlled, so any bots and low level hackers that run through them are in for a rude awakening!