Cheap way to survive in boss battle

[rpgaddict]

First u need to make ur char at least had 30 more evasion stats so equip gear which have increase Eva.

Second pick Siegfried he got skill name blind fear can cast to all enemies. Boss hardly have skill to immune debuff and seldom resist it. Is this tactics good? Well I tried and even skill from bosses can be dodge.

Or u can cast secrecy to increase ur Eva.