Just skill points for mythal crafting.
http://www.amiaworld.net/about/Mythal.htmlQuote:
Craft armor is used to craft shields, helmets, and armour.
Craft weapon is used to craft ammo and weaponry.
Spellcraft is used to craft other items.
That's the important stuff to know, lets you know what skill for what type of gear. Also, you can check the DC for mythal crafting IG by going to the mythal forge and using a mythal on the item, select what you want to do, and it will tell you the gold cost and DC for crafting it before you confirm.