It might be an easy fight nowadays, but without prober understanding of how the fight endures, it can become very challenging..
Boss Mechanichs goes something like this:
In the outer perimeter of the ovale Arena your inside are a bunch of Ghosts. The deal with the ghosts are that upon Bacterians command (When you got around 4-5 of Bacterians armor-debuffs upon you) -it'll unleash massive damage AoE abilities sent from the ghosts and most likely instant wipe your group, if you aren't long gone already by Bacterians own DoT's (which is poison, from his smelly-finger attack)
The multi-mob spawning are a kind of rage-timer for the purpose of forcing you to kill him quite quickly.
So the thing is: You need to have Bacterian Confused and Stunned (paralysis type) throughout all of the fight to avoid him making the debuffs stacking up on your group members, thus making him command the ghosts to wipe you.
To this date, a long-duration confuse ability and either highazz dps or a speed party are the best solution for a safe and sound kill.
We really need more of these bosses in the game, which actually require you to use stragedies instead of most of those tank'n'spank bosses!
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