Lustrous Rock Crystals don't drop

[Nodrim]

As the title says, two white crystals in the cave don't drop Lustrous Rock Crystals.

[parent child bowl]

You already have them. You need to find the third one.

[Card930]

You need to be a bit more violent with them.

[Massenstein]

There's a bug apparently where you can miss one of the crystals. I think the ambushing crystal dude was the one who didn't drop it for me, had to reload earlier save and backtrack a whole bunch.

[Massenstein]

Nevermind my earlier message, I must have read something wrong since I assumed two of them would drop from enemies. I was more thorough and there hadn't been a bug after all, hopefully it is the same case for you.

[Necrolite]

He have to destroy the rocks like you do with boxes in the area. Not just kill the rock enemies