This terrifying being is a manifestation of Ability's Will. It appears to challenge all who attempt to beat Survival Mode. Before being imprisoned in Survival Mode, it would only be set loose to punish those who cheat and hack, as well as being set upon Apollo with the Word of Power, -vnm. This creature, nay, God, is incredibly fast, powerful, and can kill almost anything in a Nanosecond.
The Guardian is a formidable opponent. Its speed is only surpassed by its massive attack damage. No armor will save you. The best way to fight The Guardian is to drop anything that might weigh you down and kite it around the map. Some form of detection is extremely helpful, and a CMA is necessary for most classes. The L3 is extremely effective. Also any stuns like Repulse, Faith, Force Push, and Mad Spark or speed de-buffs like the Technician’s exhaust or Engineer's Plasma Discharge will help keep some distance between your team and The Guardian.
On Nightmare Mode, the Guardian of the Beta is truly terrifying. His speed is greatly increased, and he will charge at players. Run in terror for your death is inevitable!
The Guardian of the Beta is cloaked permanently, meaning some form of detection is required to see it. Only found in Nightmare Mode.
The Guardian of the Beta can walk up and down cliffs, negating any terrain advantage the players may hold.
The Guardian of the Beta can sprint in Nightmare Mode, making it harder to evade it.