It could simply be something mundane like ‘Ice’, which is sometimes separate from water. Underwhelming for the last Seiken, for sure, but it would be an interesting thematic opposite to the first Seiken we saw, Rekka.
That said, it doesn’t look like an ice sword, so I doubt that it is ice. It’s just that after Smoke, I wouldn’t necessarily discount anything.

Well if going by KH Logic in terms of like mainline elemental spells that were like always at the forefront.

I'mma put out it's either Ice, Gravity, Time, Magnet, or Reflect.

What about metal?

Ain't that a normal sword?

yeah I expect something along the ones I highlighted. Metal seems too generic for a sword but something like Magnetism or Gravity to attract or repel things could be a thing.

Does anyone use Mystery books as a book motif yet?

There are only three genres - Legendary Beast, Animal, and Stories. If anyone did use a mystery book, it'd classify as a story-genre book.
But no, just Fairy Tales and the like so far.

But doesn't Sabela use a new type of book? Reference book?

Or is hers just Animal: Insects?

Yeah, it's just an animal book

So with next week revealing the last holy sword, does that mean we may get next month's preview scans this week?