What can you do with the Crystals you get from using Solvent on items?

Two things that I know the crystal is used for

1. Ingrediant for summoning a doll.  50 crystals 

2. Crafting weapons from the Stone Golem NPC in werldern -warp 4,  There are many different weapons but the one mostly crafted is the Wind Axe. requires 1000 crystals for each of these weapons. Just need to talk to the Golem to find out what else is required to craft the weapon of choice.

Thanks for the info Atilian!

Atilian owes me Money!