Quick answer: Open the Scavenger Pens chest for eight Universal Solvent and the Mirage Estate storeroom chest for seven. Quick Hand Zhang has it available to purchase for 2,400 Remnant Dust.
What it does
Universal Solvent sits in the “Weapon Upgrade Materials” category. Its item card reads:
“All things in this world are bound by shared principles and a subtle harmony. Thus, craftsmen versed in arcane arts devised this solvent to fuse disparate materials into one, lending an even keener edge to weapons tempered through a hundred trials.”
“Universal material required to upgrade weapons from Lv. 20 to max level.”
You need it for every weapon upgrade past level 20, so it is worth collecting as many as you can.
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Scavenger Pens chest (x8)


Mirage Estate storeroom chest (x7)

Buying it
Quick Hand Zhang has Universal Solvent in his shop at his Mirage Estate hideout. Each one costs 2,400 Remnant Dust.






