Odin's normal attack deals around a thousand damage, which is onerous but which Rosa could keep up on her own, but that doesn't really matter. What matters is this: after one or two attacks, Odin's sprite raises his sword. This signals an extremely short time window; once that window has passed, Odin uses Zantetsuken, hitting the entire party for the kind of damage you can see above, easily killing everyone in a single move.
I try casting Protect. I try having everyone use the Defend command to brace for it. Nothing helps. If Odin uses Zantetsuken, it's a party wipe.
This means that, in order to win, I have to kill Odin
before he gets to use that move. Which, again, he uses on Round 2, Round 3 at the very latest and I don't like relying on luck. Now, luckily, I know Odin has a lightning weakness - and thanks to my consumable Bestiary items, I know he has 20,000 HP.
So.
Rydia is lv… 44, I think, at that point. Recently, she learned Blizzaga (the Tier 3 Ice spell, for those who struggle with the naming convention), and even more recently, Firaga. Which means that I am pretty sure she's at most one level away from learning Thundaga. And as it happens, the Sylph Cave still has some loot that I haven't bothered getting yet because it involves more hidden wall games.
Well, the game just gave me a reason to head back.