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Vampires
It was said to be one of the most powerful monsters that were currently known in the game. It was either a higher type of undead or a powerful demon.
They had a very strong mental prowess and unrivaled strength. They also had powerful magical prowess and were skilled in blood and dark magic. On top of these, vampires were known to have a very high regeneration rate.
Mostly, the longer the vampire lived the stronger it was.
These were the basic information that the top players had regarding this particular monster. There was not much information about them yet since it only appeared a single time.
Based on the calculation of the theory crafters of the game, the players would encounter these kinds of monsters in the highest-grade maps that were going to be available once most of the players reached the tier 3 rank of their respective class.