FemCorrin here.
Oh yes, I saw the spell list too; nice on adding frost spells, and bringing back Bolting and Purge and not making Eclipse suck as much; Swarm and Mire are such boooooooring Seige spells, after all, and we've been plagued with them for three games now.
A little disappointed with Luna, but then it's one of those tomes that's either the most broken thing in the game (I mean, 1/2 resistance ignored at 0 MT means that it's kind of permanently bad, even with FE7-levels of hit, but not quite Sacred Stones-level of bad because at least you can hit things with 75 hit) or kind if mediocre. I'm nonetheless now officially undecided if I wanna pick up Dark Magic on Catherin when she promotes.
I think I'll leave that up to her character arc, when it unfolds.