Gladiator Hulk. If you have him as a 4 star then you're good to go. Characters with burst damage at the beggining of the fight (like Corvus) are pretty useful as well I assume.
Use a Regen champ Or take champs that have class advantage against majority of the opponents Flare degen is based on class relationships An advantage means you won't die quickly
Flare is easy...I used my 4/40 burst damage champs to finish fights for the initial clear...when I got around to exploration I had 4/55 champs so the fights were over in 10 or so hits...just play agressive,use burst damage champs and don't bait specials as the opponent will be dead before reaching sp3
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Or take champs that have class advantage against majority of the opponents
Flare degen is based on class relationships
An advantage means you won't die quickly