BrownDust-ism.

Addicted To Gacha

Underground Evil Castle 41 to 45F

You will need multi-attackers to take down all foes. Boss have counter damage based on Max HP, so if tank with vital runes attacks boss, tank can get killed. Thus avoid attacking boss with tank or equip shield runes. I think this time it's more forgiven and can use different mercs and formations than other floors.

☆☆☆ Underground 41F (Strategy 1) ☆☆☆
  1. ★6 Christina+15 (Kill 5, 8, 9|4, 7, 6|11)
  2. ★6 Catherine+14 (Kill 2)
  3. ★6 Hephaesia+15
  4. ★6 Niya+15 (Kill 3|1)
  5. ★6 Benshina+14 (Kill 10)
☆☆☆ Underground 41F (Strategy 2) ☆☆☆
  1. ★6 Levia+12 (Kill 1)
  2. ★6 Christina+15 (Kill 5, 8, 9|4, 7, 6)
  3. ★6 Niya+15 (Kill 3|10)
  4. ★6 Dr. Morgan+9 (Kill 2, 4|11)
  5. ★6 BDM N-504+9 (Kill 7, 4)
☆☆☆ Underground 42F (Strategy 1) ☆☆☆
Daniel is not only there for Curse counter, but also on 2nd round, his extra turn can expire enemy taunt which was pillaged before Christina's turn.
  1. ★6 Daniel+9
  2. ★6 Sarubia+10
  3. ★6 Christina+15 (Kill 4, 7|2, 9|6)
  4. ★6 BDM N-504+9 (Kill 10, 8|5|3)
  5. ★6 Benshina+14 (Kill 1)
☆☆☆ Underground 42F (Strategy 2) ☆☆☆
  1. ★6 Sarubia+10
  2. ★6 Christina+15 (Kill 4, 7|2, 9|6)
  3. ★6 BDM N-504+9 (Kill 10, 8|5|3)
  4. ★6 Angelica+13 (Kill 1)
☆☆☆ Underground 43F (Strategy 1) ☆☆☆
  1. ★6 Catherine+14 (Kill 5, 2, 3)
  2. ★6 Eleaneer+15 (Kill 7)
  3. ★6 Christina+15 (Kill 8|4, 6|9)
  4. ★6 Niya+15 (Kill 1)
  5. ★6 Benshina+14 (Kill 1)
  6. ★6 Helga+15
☆☆☆ Underground 43F (Strategy 2) ☆☆☆
  1. ★6 Yuri+14 (Kill 7)
  2. ★6 Sarubia+10
  3. ★6 Christina+15 (Kill 3, 5|7, 9|1)
  4. ★6 BDM N-504+9 (Kill 4, 6|2|8)
  5. ★6 Benshina+14
☆☆☆ Underground 44F (Strategy 1) ☆☆☆
  1. ★6 Eleaneer+15 (Kill 6, 5, 8|1)
  2. ★6 Christina+15 (Kill 4, 9|7)
  3. ★6 Viola+10 (Silence 5, 6)
  4. ★6 Dalvi+15 (Kill 3, 2, 10)
  5. ★6 Benshina+14
☆☆☆ Underground 44F (Strategy 2) ☆☆☆
  1. ★6 Veronia+14
  2. ★6 Catherine+14 (Kill 4, 2, 3, 10, 9)
  3. ★6 Viola+10 (Silence 5, 6)
  4. ★6 Eleaneer+15 (Kill 6, 5, 8|7)
  5. ★6 Angelica+13 (Kill 1)
☆☆☆ Underground 45F (Strategy 1) ☆☆☆
Unlike other floors, 45F's boss has fixed damage counter. Therefore if regular mercs attacks boss, they will die. With this particular formation, sometimes Catherine fails to kill 10. If so try again.
  1. ★6 Lulu+15
  2. ★6 Catherine+14 (Kill 6, 10, 5, 7)
  3. ★6 Christina+15 (Kill 4, 9|8|3)
  4. ★6 Eleaneer+15 (Kill 2|1)
  5. ★6 BDM N-504+9 (Kill 12)
  6. ★6 Benshina+14 (Kill 11)
☆☆☆ Underground 45F (Strategy 2) ☆☆☆
  1. ★6 Refithea+15
  2. ★6 Granhildr+15
  3. ★6 Catherine+14 (Kill 6, 7)
  4. ★6 Eleaneer+15 (Kill 2|8)
  5. ★6 Christina+15 (Kill 10, 5|11, 3|1)
  6. ★6 BDM N-504+9 (Kill 12, 4|9)
☆☆☆ Underground 45F (Strategy 3) ☆☆☆
You can use Beliath instead of Levia here.
  1. ★6 Levia+12 (Kill 1)
  2. ★6 Granhildr+15 (Kill 4, 9 by counter)
  3. ★6 Catherine+14 (Kill 6, 7)
  4. ★6 Niya+15 (Kill 2|8)
  5. ★6 Christina+15 (Kill 10, 5|3|11)
  6. ★6 BDM N-504+9 (Kill 12)