If you don't have a team that can reliably do overheal, I'd go and train what's most compatible with my current teams. You generally see key members like Matryoshka, Clara or Merlin, or even Diablo+PR Sprite go into teams tackling overheal stages anyway.
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Allies (All/Dbl Max): Darkness, Aqua, Kurama
Other Frequently Used Leaders (All/Dbl Max): Lucy, Mellow, VR Greek (FELDW), Hiei, Azathoth, Daoloth, PR Haza, etc.
Allies (All/Dbl Max): Darkness, Aqua, Kurama
Other Frequently Used Leaders (All/Dbl Max): Lucy, Mellow, VR Greek (FELDW), Hiei, Azathoth, Daoloth, PR Haza, etc.