I wish I could beat 297 Hera but I'm not even gonna try. Too much crap I need to spend stamina on.
Don't worry about it. It'd be nice sure but that dungeon is the devil. The first few floors require either short cooldown actives to manage the constant orb trolling or luck. Beyond that it's meant for mostly developed teams that are either just finishing hypermaxing or just about to go down that path. My alt has a decent team and still hasn't cleared it.
So I looked into Machine Athena teams. There's a way to clear it solo with heavy reliance on inheritance and some REM luck. In multi there's a dacho carry for it provided the team carried has Grodin the rest is farmable (It takes a bit over 20 minutes with optimal skill ups longer without).
Solo Grodin team I plan on running when the opportunity presents itself:
Grodin (Sojiro/Jize)
Zeus Dios
Sanosuke (Australis)
Avalon Drake
G/D Ceres (Carat)
Grodin (Raphael)
Interestingly skill binds don't affect this team at all.
Grodin (Sojiro) is for killing Zeal before he becomes a problem
Dios is for kill boards
Sanosuke is for double killers that actually get some use here, Australis pairs with Raph for a kill shot on Star Justice.
Avalon Drake is for the combo check floor
G/D Ceres has machine killer, Carat is for the significant number of skill boosts on this team
Grodin(Raphael) is for Star Justice's resolve.
So I either need a friend Grodin with Raph, or a friend Grodin with a 99 damage active. Note you actually do need Grodin's active to clear the awakening bind. This team relies HEAVILY on the autoheal awakenings on the team without those it's RIP if you don't skyfall hearts.