Eternity can be pretty boring, after all, especially if you're stuck in one place.

[ even five centuries is quite a length of time for her, though perhaps that might be because she's been separated from her twin brother for so long that it's become unbearable. ]

There's only so much one can do after a hundred years or so ...

[ and that's with her and her brother traveling through worlds. ]

I guess that's why you've decided to learn how to play different instruments, then.