[Coda]

So it turns out you get Tamazo X Awoken Odin if you beat the dungeon!

U&Y - BOdin - Muse - Elia - Valkyrie seems to be a decent choice of team. Have you gotten Valkyrie evolved with Ana yet?

If you can partner with Kanna, then do that and swap out Muse for Shiva, because Shiva's active will be a significant help against the final boss.

Otherwise, U&Y is probably your best ally leader. Awoken Horus is reasonably good.

If you have to borrow a leader from me... um... Izanami is probably the best choice if you don't mind spending some stones to get a guaranteed god dragon and Tamazo X Awoken Odin; the hit to your HP is going to suck but the damage output means you'll be killing stuff faster and PROBABLY need fewer continues.