True true. Like i said, it was suggested in another topic here. I just quoted the idea here assuming people would want a boost on HQ rate (based on OP). The powder thing is actually very similar to what Raijin said...you're pretty much turning a finished item into something else to boost another item. I'd assume the way you said it like a reforging, right? Multiple synthesis to enhance an already finished weapon.

I must say i saw a system similar to this one at Dragonica, where you could reforge over and over an weapon until you reach the obscene HQ of +20. But if you fail upgrading it you could, from losing partially or completely the HQ effect (becoming NQ again) or, after a certain point, even losing the weapon. I didn't like this much because it was like gambling ALOT of work (specially since dragonica is heavily based on cash shop so the reforge rate was minimal after a while to force people buying stuff to protect the weapon from breaking if it fail).

But if you want me to say a game that excells in anything regarding weapon upgrades, i can suggest the summon night serie (GBA/DS). The reforge synthesis there is awsome, with you having the "blueprint" of weapons only...like you can synthesis a "Bhuj" but the finished bhuj will be based on what you put on synth. An example would be like this...i pick a bhuj recipe and it lists a head, a shaft, a butt, a clasp and a glue. Its up to you to combine the items the way you want, with some generating different weapons (if you use a bronze bhuj head you will have a bronze bhuj, if you use an iron bhuj head you will have an iron bhuj) and others just changing the effects of it (like adding an ash shaft would end i a bhuj with better accuracy while a cedar shaft would end in a bhuj with better attack)...and if you get an HQ you being able to exchange the stars for even further bonuses (like a iron bhuj +2 could be enhaced by exchanginh a star for a reforge with an item that adds +5 STR effect, becoming then a iron bhuj +1 with +5 STR additional effect. You then could exchange again the star for another reforge, lets say i add an item that adds + 5 DEX this time...it would become a iron bhuj with additional +5 STR and +5 DEX effect).

Even further, similar to a tactics game from SE i forgot the name (all the artwork was made by the same artist that do FF artworks), if you follow a certain reforge path you may not reach what you wanted, but a totally different item (like...if it was a +3 iron bhuj instead of a +2 and, after i made an iron bhuj and add + 5 str and +5 dex i did a third reforge adding another +5 STR and it happens to be the correct path for a Conqueror Bhuj, isntead of receiving my Iron bhuj with additional effects i'd receive an conqueror bhuj, which is obviously more powerful than the iron bhuj with the 3 additional effects). But of course that reforges would add no HQ version...or else this would have a chance of keep going forever if the dude is extremely lucky.

But back to summon night...the cool there is that you can even name your weapon after a certain amount of reforges, which woould be very nice here too as soon as renamed item become exclusive.