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No...
Also no, but a full spell list is nice. Also, apparently my problem was forgetting to come back to the Bone Dungeon when I got bombs. 
Okay, there we go. Might as well go after Flamerus since he's right there, though. I mean, this is basically a 100% seed by now anyway, right?
Oh hey, there's the Cupid Locket.
...and yet another fragment.
Just to make this slightly less short, I might as well hunt down the rest of these. Any guesses on where the other two wound up?
...I didn't realize I'd accumulated that much cash...
There's one.
Well, if you guessed they would both be on Mac's Ship, congrats. Not like there was anywhere else to put them, though...
Though it does beg the question of where the Steel Sword wound up; that's literally the only thing I haven't found by this point.
Okay, turns out you don't actually need to turn the Sky Fragments into the Sky Coin; just showing up here with enough of them works. Suppose that makes sense, with how they were implemented...
...I forgot I used the "boss rush" setting for the Dark King accessibility parameter...
Might as well give you screenshots of the rematches self-destructing for the road, right?
Like so.
Okay, that's just wimpy. What the hell. Selfdestruct's damage is based on the user's max HP, right?
Though to be fair, it's a boss rush, which means each individual boss can get away with being weaker... but still.
Ummmm... okay then. Somehow I didn't quite expect this guy to self-destruct like this. I mean, I obviously knew it was a possibility, since I got the screenshot, but...
Well, anyway, he had so many HP the damage overflowed and healed Phoebe. That's ridiculous.
Not gonna go back through with a fine enough comb to find that Steel Sword; I'm callin' it here.