Lost crystal is a rare drop from the crystal node at 48F. You might need several attempts so save before gathering and reload if you don't get it. You might get 2 or even 3 in a row very rarely.
Floor 48 at crystal gathering point. Better chance on higher difficulty
Usual consumable merchant in your inn (check the book)
I just got it from 27F too so it seem it's just a very rare drop but not exclusively on 48F
Very rare then. Probably it could be found at earlier than 48F floors but the only place I could get them from easily (actually the only place I did) was there. Surely even better if you are using a coin since it improves drops making nodes yield up to 4 - 6 items instead of 3 (Lost crystal, Heavenly crystal and Thunderous crystal still drop 1 though)
Click on the sign to check it first
Not a monster but a green crystal. At 8F, the cave at the top of it. It becomes the Zoo once you give it a few monsters but the crystal stays.
if you went pure route, there a ending based on whose of the 4 heroines is the higher, if went dark route the ending depends of the grade of depravity you went to others, if you raped the girls, if you raped any other individual but your companions, and if you went murder happy every npc you meet.
Keep foward and you will answer that questionIs there any way to save Nami the demon girl
It was my 1st playthrough, i went pure route and raped no one and beat the extra boss too but i didn't get Irito ending, i got no h-scene so i assume that the ending i got is not heroine specific.
Yes, don't worry doing it once won't affect your "karma" if you are trying to do the good route
From wiki translated by google:
Go deeper into the layer, you get better and better material including hellish mist and other stuff about every ten floor
