C499 Rage to Farm 2 Trillion Spirit Beads

If my guess is correct, this is the Darkness Elemental Mastery that is superimposed on the Engulfing Darkness Hippocampus!

The number of low-level skills Darkness Corrosion stacked together is already so terrifying, let alone the high-level skill, Elemental Mastery!

The Darkness Domain should originally be a muddy pond of darkness