Think I'ma make 2 6*'s tonight & want to be able to auto GB10

So I have Ramagos (Wind Warbear), Taharus (Wind Elemental, was actually hoping he'd be usefull for GB10... But he's going to need some good runes to speed the runs up and not die), Dagora (Water Warbear), Raoq (Fire Inugami), and Sath (Fire Grim Reaper) all at max level 5^x , all runed, all max skilled, and all collecting dust. I'm going to feed them along with some other fodder I have laying around (fire kfg, wind barb king, fairy queen, fire lich, light ninja, all unawakened max 4^x ) in hopes of making a team that can auto B10. Currently, I can auto through the crystals with a rare casualty, but the giant just destroys my lower HP units. Manually, I have no issue and can clear it every time.

Current monsters (not counting feeders): • 6^x : Veromos, Julie, Bella, Chasun • 5^x : Bernard, Jojo, Shannon, Lushen, Ran, Hwa, Baretta, Darion, Ahman, Megan, Copper, Dias, Draco, Verde, Orion, Lapis, Kona

Current GB10 team is Vero, Bella, Chasun, Shannon, Darion.

Any tips on what 2 monsters deserve 6^x the most and why? Was thinking either shannon/bernard or shannon/lushen, but really want input before I feed all these mons xD Also I really need to focus on giants/dragons... So keep that in mind xD