Xarbala posted:

It's a weapon tree system a la Monster Hunter, so you get the option to turn it into one of the next tier of weapons in its tree. Making a new weapon by a reforge is usually cheaper in terms of resources than crafting the same weapons from scratch, though as Belzac mentioned some weapons can only be obtained by reforges. Fortifying takes your weapon and simply upgrades its stats rather than changing it into a new weapon.