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Explanation: Rouse and Renewal are the best spell combo to hit your team with at the start of each new dungeon level.
For heroes, we have the ever necessary PD (with 10/10 skill and 8/8 berserk)
Tanks: Michael x2, Dread Drake x2, Skull Knight x2, Espirita
Buffers: Valentina, Athena
Healers: Druid, WallaWalla x2
Damage: Phantom King x2, Trixie Treat x2, Rockno, Lil Nick, Santa Boom
(And of course quite a few of these heroes fill multiple roles, such as Michael as a Buffer/Tank and Druid as a Healer/Buffer, etc.)
All of the heroes are evolved, giving them extra durability, as well as the use of artifacts and augmented equipment.
There will still be a huge amount of luck involved - getting the right enemies in the right configurations, hoping your team doesn't split up, hoping you don't drop in the center of a Skeletica/Gunslinger ambush on Dungeon 5 - but a good team like this will help you go far.