Zex

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How does the weapon upgrade system work for upgrades within the same grade? For example - How do you use "Weapon Varnish - B Grade" to upgrade a low B weapon to a high B weapon? It says to talk to the Aden blacksmith, but his chat window only has upgrades for over enchanted items (going from D grade to C grade, etc...). Does a new chat window become available when you have the weapon varnish in your inventory or am I missing something?