I'm getting pretty frustrated trying to fight the bosses protecting the hidden jobs. My characters are level 61-63 and from what I've read online this should be doable. I heard the warmaster was the easiest, got my guys geared up for physical defense. Have two Warrior / Merchants using sidestep / incite drawing most of the guy's attacks. Olbrec can do about 28,000 damage with his divine skill if the boss has his guard down. I have Ophelia so that after she dies the first time I give her a (L) olive and she goes up to 9,999 life and can absorb a few attacks. Cyrus is subclassed as a apothecary and he keeps up the poison that does about 3,000 damage every turn and spells to help break the defense.
But I can't seem to win, I keep getting the boss down to about 35,000 HP and he starts attacking like 8 times per turn - far faster than I can keep up with sidestep. Eventually I just lose to attrition.
Any tips? Am I just too low level? I've spent about 4 hours now fighting this boss to no avail.
For Warmaster, it's all about buffs and debuffs. I had:
Olberic - Apothecary
Cyrus - Merchant
Ophelia - Dancer
H'annit - Thief
You cannot take too long or else you'll die. You need to make the most out of every break. Don't break unless:
a) each/most characters will get two turns before the boss gets a turn again, have 3 BP if they're attacking, enough SP
b) boss' defense is down (Thief - Armor Corrosive)
c) Olberic's/physical fighter's attack is buffed
d) If you use Cyrus and Ophelia or someone with their jobs, have Ophelia use her Divine skill on Cyrus so he gets 4 magic attacks, maybe buff Cyrus if you have time with Dancer's buff for elemental damage
I beat this boss at level 50 and did 40-50k damage per break with this strategy.
While the boss' defense is up, use Merchant - Hired Help -> First option to buff defense, use Hunter - Leghold Trap, and a Thief to keep the boss's attacks debuffed (Thief - Shacke Foe). Ophelia heals almost every round. On that note, you should get Saving Grace passive skill (from Cleric) so you can heal people above their HP, this can mean 6-9k HP in some cases. Then just get her break level to 1 or 2, make sure everyone is buffed as above, and break her.
In fact, I use this strategy on almost every boss though I may switch jobs around if the boss has a gimmick or very different attack type. I mostly use passive skills that make buffs last longer and increase attack stats.
Oh and as it's obvious from this game, you need good equipment. Level doesn't matter much. Also I found Runelord much easier.