BrownDust-ism.

Addicted To Gacha

Co-op Raid Patan

☆☆☆ Normal ☆☆☆
This formation normally goes to 94%, but if lucky, it can go all the way to 100%.  The key here is Garinoth do nothing on Wave 1, so that he will be ready on Wave 2's first round, and attack the boss.  If Garinoth couldn't kill the boss, then this formation is designed so that the boss will target Hyeon Wol.  Rafina will survive the boss's attack, so before we get wiped, attackers still can attack 1 last time. I used Deka instead of Rafina, and got the same result.
  1. ★6 Anais+9
  2. ★6 Arines+9
  3. ★6 Vincent+9
  4. ★6 Hyeon Wol+9
  5. ★6 Rafina+9 (Wave 1: Kill 3, 5, 9, 7, 11 Wave 2: Kill 2, 3, 5)
  6. ★6 Alche+9 (Wave 1: Kill 4, 6, 8, 11 Wave 2: Kill 4)
  7. ★6 Seir+6
  8. ★6 Veronia+9
  9. ★6 Viola+9 (Wave 1: Kill 1, 2, 10 Wave 2: Attack boss)
  10. ★5 Garinoth+1 (Wave 1: No action Wave 2: Attack boss)
☆☆☆ Hard (2019-06-23) ☆☆☆
100%!
  1. ★6 Seir+10
  2. ★6 Anais+10
  3. ★6 Ceres+10
  4. ★6 Naressa+10
  5. ★6 Mary+10
  6. ★6 Alche+10 (Wave 1: Kill 4, 6, 8 Wave 2: Kill 4, 6, 8)
  7. ★6 Wiggle+10 (Wave 1: Kill 3, 5, 7, 9)
  8. ★6 Viola+10 (Wave 1: Kill 1, 2 Wave 2: Kill 7, 9)
  9. ★5 Zarka+10 (Weakening Patan)
☆☆☆ Hard (2019-03-04) ☆☆☆
Up to 86~89%.  Almost for certain, only the boss will remain.  On wave 2, Viola needs to kill 7.  Otherwise Seir will attack 7 and get buff prohibition and won't be able to heal herself on 2nd round on.  To avoid that Astrid need to attack before Viola and make sure Astrid will lure attacks towards her.  This will ensure Viola will survive until the boss's attack.  I don't know the reason, but if Viola get killed by mobs, 7 may survive Viola's decomposition.  Maybe once merc dies DoT is based on merc's base status without buff?
  1. ★6 Seir+10
  2. ★6 Hyeon Wol+10
  3. ★6 Ceres+10
  4. ★6 Mery+10
  5. ★6 Veronia+10
  6. ★6 Alche+10 (Wave 1: Kill 4, 6, 8 Wave 2: Kill 4, 6, 8)
  7. ★6 Wiggle+10 (Wave 1: Kill 3, 5, 7, 9)
  8. ★6 Astrid+6
  9. ★6 Viola+10 (Wave 1: Kill 1, 2 Wave 2: Kill 7, 9)
☆☆☆ Hard (2019-01-02) ☆☆☆
Go round 80~90%. On wave 2, after the boss's attack, only Seir and Astrid will remain, so need to totally rely on Seir+10.
  1. ★6 Seir+10
  2. ★6 Hyeon Wol+10
  3. ★6 Vincent+9
  4. ★6 Ceres+10
  5. ★6 Veronia+9
  6. ★6 Alche+9 (Wave 1: Kill 4, 6, 8 Wave 2: Kill 4, 6, 8)
  7. ★6 Wiggle+10 (Wave 1: Kill 3, 5, 7, 9)
  8. ★6 Viola+9 (Wave 1: Kill 1, 2 Wave 2: Kill 7, 9)
  9. ★6 Astrid+6