Dear Gilgamesh Party via Sirensong Sea... (aka "I don't know my Job/Role!")

[Kahnom]

Advance means you move forward.
Retreat means you move backwards.

So..the boss uses skill "Morbid Advance" and "Morbid Retreat" ?
Damn I never read the full name of this skill D: ...
That "something" I mentioned is already the answer for my own question...
I should have paid more attention.