is it possible to upgrade from large scale with the mystic forge?
Yes it is possible to transmute large scales into armored scales. You would need a total of 50 Large Scales, 5 of the tier 6 Dust (forgot the exact name), 5 Philosopher Stones and 1 Armored scale. Then combine them all in the mystic forge. This will generate a random number of Armored Scales. I use this to transmute Potent Bloods into Powerful and it usually gives me a number around 10-15. Not sure what determines the amount you get though. But you could use this recipe for most of the fine crafting materials and also ores, cloths and etc.
80 Warrior Blackgate Server