There are many Moonstone Crystals, like Dark and Light, Earth, Wind, etc., but none of them show anywhere, not in shops, not in my WL. How come and where can I get them?

these are new items to me. They look like weapon modification crystals. This may mean that they are crystals you can buy int eh Battle Shop for Battle Tokens, or they may be a new perk you get for buying CSC with RL money instead of buying them indirect from others.

Yep, you're right, probably something to do with the Battle Shop, there's a bunch of other crystals there (tear, baguette) but no moonstone, might be new. Thanks for helping :)

They were meant to be weapon mods, but they were never released. I think the battle admins decided that the mods we had (tear and baguette crystals) were powerful enough, and anything more would be overpowered.

You can see them all on SubetaLodge.

Oh yeah, forgot about the lodge, thanks! :) :*