By Makimoke: Fuu and RValk lv 80, the rest is between 30 and 40. No skill ups except for RValk.
Stall as best as you can on the floors before leviathan, so as to get at least Echidna, Fuu, Ur-Chimera and Azure Valk's skills ready. When you're in front of Leviathan : pop Echidna > Fuu > Ur-Chimera > Azure Valk in that order and finish it.
By david: Healer spike team. (this is the team i ran rank 82) You could probably replace Metatron and Sun Quan for valkyrie. Try to stall until sun quan, echidna and shynee are up. F1-F5 stall, take a few hits if you have to. F6 use sun quan to OHKO the ivory dragons. F7 use echidna as safety and then shynee, probably OHKO or close to.
By *A44: Leader can be any devil multiplier (I only had Belial). Use CDD on Ivory Dragons then use Lilith skill. Match all dark orbs.
On Leviathan attack until he's on 1 or 2 trn (2 if health is only half) then use Astaroth (orb changer), Hellwind (Def break 25%) and King Baddie (x3 ATK) and nuke Leviathan.
By ngrdix: CHALLENGE MODE
3x ADKZ build. All Ronia max awoken. Melt everything. Stall long enough that all Ronia up by miniboss. Used 1 Ronia active on those and 2 Ronia active on the boss.
By justin@pf: CHALLENGE MODE
All you need is a couple Genbu friends, Echidna, and monsters to meet Genbu's requirement. Go dark or green-heavy depending on the dungeon. This will work for every OoH level except for Sea-God of Heaven, where you need SoD Luci in the lineup.
By C万梨Castle: Ruka can be any orb to heart converter. Chimera and Snow Globe can be anything with same/similar skill. Use Ogre or Snow Globe against devils if necessary. May use Ruka for emergencies. Save other skills for FLR 6 and 7. Focus attacks on one Ivory Dragon at a time. Charge up HP between boss attacks.
By Newtorious: Have dragons at least in their 60's, 6.25x attack on all dragons, pop DAL's skill on Ivory dragons for one shot kill, drop ADK's skill when low on wood orbs. Win in 5 turns or less.
By Kaylie: Any Monster With Rondo Of Healing Works For The Leader. Wood SamuraidDragon Can Be Subbed For Any Strong Wood Attacker With High HP.
By James: Easily built Mystic Mask friendly team for early Leviathan clearing. Charge skills in round one. Use Keeper on dangerous stages and against Divinegon. Clear same-turn Divinegon first. Dark subs (Vampire Lord, Chaos Dark Knight) suggested. Have full health for Leviathan attacks.