Point 1：You will need at least one of Valzé, Mamonir, Eldora, or Karin for this. Arcstar can neutralize Inc DMG boost, so normally DMG boost does not work. However these mercs have a special skill that can ignore the neutralization, and can output massive damage. Point 2：Use as many mercs as you ...

☆☆☆ Without Eldora / Mamonir / Karin ☆☆☆ First thing you have to do is to use stats weakening skills. (Please see here for recommended mercs with weakening skill) This is not only to increase the damage to Arcstar, but also when you attack Arcstar, it has Overcharge which is like a counter damage, ...

First thing you have to do is to use stats weakening skills. This is not only to increase the damage to Arcstar, but also when you attack Arcstar, it has Overcharge which is like a counter damage, therefore it also reduces the damage you take. It’s ok that mercs who apply stats weakening to die. Jus...

First thing you have to do is to use stat weakening skills.  This is not only to increase the damage to Arcstar, but also when you attack Arcstar, it has Overcharge which is like a counter damage, therefore it also reduces the damage you take.  It's ok that mercs who apply stat weakening will die.  ...

First thing you have to do is to use stat weakening skills.  This is not only to increase the damage to Arcstar, but also when you attack Arcstar, it has Overcharge which is like a counter damage, therefore it also reduces the damage you take.  It's ok that mercs who apply stat weakening will die.  ...

First thing you have to do is to use stat weakening skills.  This is not only to increase the damage to Arcstar, but also when you attack Arcstar, it has Overcharge which is like a counter damage, therefore it also reduces the damage you take.  After it is weakened, apply Concentrated Fire as many t...