here are a list of the flasks people can and should buy for this as we learn the fights. They last for 2hours through death so it will be money well spent

[Unstable Flask of the Beast] (Agility, Strength, Stamina) 
[Unstable Flask of the Bandit] (Agility, AP, Stamina) 
[Unstable Flask of the Elder] (Intellect, Stamina, MP/5) 
[Unstable Flask of the Physician] (Intellect, Stamina, Healing) 
[Unstable Flask of the Soldier] (crit, Strength, Stamina) 
[Unstable Flask of the Sorcerer] (Intellect, Stamina, Spell damage)