Duach's Crystals do not work in game.

Currently you cannot use the Duach's Crystals in the game. When you go to "use item" nothing shows up in your inventory. Please fix this problem.

I just tested two Duach Crystals, one in my inventory and one in a container (backpack) and they worked both times.

How did you get it to work?

@Vickstress do you have theurgism skill?

It's a battle spell item, from what I remember. That means it can only be used during a fight. You would click on use item and choose it. You cannot use the item outside a fight.

I was able to use them yesterday in battle also, must have been how I had them in my inventory.