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 can to stack up strong Inc DMG boosts. Please see here for recommended mercs with incoming DMG boost skill here.

Point 3：In 2nd round, mercs 1 to 5 need to die after they attack by Arcstar’s counter. This will increase Eindolin’s support, thus Mamonir can do even more damage.

1. ★6 Alicia+14 (Incoming DMG boost +65%)
2. ★6 Wester+1 (Incoming DMG boost +50%)
3. ★5 Zarka+10 (Incoming DMG boost +145% Status -65%)
4. ★6 Esther+9 Incoming DMG boost +65% Status -50%)
5. ★6 Orienne+10 (Incoming DMG boost +125% Status -65%)
6. ★6 Eindolin+10
7. ★6 Michaela+15
8. ★6 Isabel+11
9. ★6 Martina+10 (Incoming DMG boost +100%)
10. ★6 Denarisa+10 (Incoming DMG boost +125%)
11. ★6 Veronia+10
12. ★6 Mamonir+6