Crafting Materials

Can anyone tell me why I can't craft this item?

So on the JP site Soul of Thamasa requires a "Large Soil Crystal" (google translate) it doesn't appear to be the same as void crystal as that appears as "Large Crystal of Nothing". Does anyone know what the Soil Crystal might be? Something not implemented? I'm trying to hoard items for it.

So I thought this might be helpful for anyone curious about how many books of refinement an MR weapon will take.

Your first awakening costs 30 books.
Your second awakening costs 50 books.
Your third awakening costs 75 books.
Your fourth awakening costs 100 books.

If you plan on fully maximizing your weapon to full potential, you won't need to use the refinement books until you get them to +2.

For your +2 you'll need to get them to level 20 for the +3 evolution. +3 to 30, +4 to 40, and +5 is yours to do what you want :)

So here's what you'll need.

+2:
4 x 30

+3:
2 x 30
2 x 50

+4:
1 x 30
1 x 50
1 x 75

+5:
30
50
75
100

To get one weapon to +4 you'll need 435 books. For 2 that'll be 870 books.

Total Lv5 +5 = 1125 books of refinement.

*the list up above covers for 1 +4 weapon. Just multiplied it by to.. added the awakening steps to get the total of 1125 books*