Help with a boss.

There are a few strategies that we use to defeat Hazeezus depending on what kind of party you use, each quite different from each other. Consider both, and see which will be most useful to you. We hope this helps!

Recommended
level 38+. Once you ARE ready, here's what you need to do:

Firstly, have some Quicken Scrolls, and use one at the beginning of the battle.
Then focus solely on surviving. What you need to do now is get Xiria set up
with Glory of Chaos/Magick Drain combo, have Magus use Dark Embrace constantly
and Isis heal, buff when needed and use She'Dian Might if you can. Try and
have Drea use items to heal you when you can to give Isis a chance to attack,
or just have her attack regularly. The main thing working against you is time,
this will take a long time as Hazeezus has an INSANE amount of HP, and a
seemingly bottomless well of MP. His attacks range from bad to oh god stop,
stop he's already dead, mitigate damage immediately or you'll be deader than
putt-putt, fast. He can poison you, use instant kill attacks, debuff you, buff his
own agility...it can get ugly. If you can't beat him, level up by doing a
runthrough or two of the abyss, and come back. The hardest part of the battle
is the middle, when he starts using his best attacks more often. Towards the
end he starts focusing more on buffs and debuffs, and even though he'll often
use Agility Bless on himself, he likes to do it a few times in a row, wasting
turns. It is also entirely possible that he may run out of MP at some point,
which makes the battle a lot easier. If you notice he's using his physical
attack a LOT more often, that's probably the case, you can verify this by
trying Magick Drain, if you get very little or nothing from him, he's out of
MP. Beating him nets you an Ultra-Elixir and the Dark Dragoness Blade. You'll
notice no one in your party can equip this sword, which is a hint as to another
secret, but more on that later.

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Recommended Level: 45+
Suggested Party: Magus, Krysta, Isis, Aubriel

To unlock Hazeezus as an opponent you must first eliminate the three opponents on the list before him; Neo-Tera, Quietus, Harbinger. Choosing Hazeezus as an opponent will make him appear and speak a line before facing you. The first thing you will want to do is use a Quicken Scroll to get an edge. Keeping HP totals at max is vital to survival so use your best restorative items as needed if things look grim and it isn't Isis/Aubriel's turn. Get Weapon Bless on Magus and have him spam Onslaught. If Krysta has a free turn use Blade Storm. Aubriel's Holy Radiance will do nice damage on Hazeezus so use it when she has a free turn. Isis will be busy using Agility Bless and Healing but if she has a free turn then she can use She'dain Might. The trick here is to never let anyone fall down. As the battle goes along, Hazeezus will eventually use Agility Bless on himself and inflict the party with curses like Stagnate and Weapon Curse so counter it with Agility Blesses or Quicken Scrolls. Unless Magus gets effected by Weapon Curse, you can ignore this ailment (as he's the only one who should be actively attacking). If you have the HP to survive his attacks (~3000 or so), then it is only a matter of being patient and chipping him down. For your efforts you will be given the Dark Dragoness Blade needed to collect a Bonus Character.