Tutorial/Overflowing Abyssal Power...

Due to its proximity to the "border" of the world, ominous and unpredictable forces seep through the Abyssal rifts and spill forth onto the land of Nod-Krai.

Such ominous forces will create an area affected by Abyssal Decay. Only by defeating or clearing the Abyssal Monsters or Abyssal Entities can the Abyssal Decay be minimized, and then purified.