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Background
You'll trigger this quest after you've completed the quest
Enchanting: Start-Up Costs for the runewright at the Upper Mill in the
Novigrad Far Outskirts (#1).
Walkthrough
At the start of the quest, the runewright will tell you that he still needs one more thing before he can open his shop -- "a jade stone of size substantial." Before you can go mining for such a gem, you'll need to acquire a
Pickaxe. Luckily, you'll find one in the barn attached to the house just to the east of the runewright's tent.
Once you've grabbed the
Pickaxe, the game will show you three places where you might be able to find
Jade. However, the northernmost and southernmost sites won't yield a large enough stone, so you'll have to brave Bloodrot Pit (#2), where you'll encounter a cluster of arachnomorphs (spider-like insectoids). After defeating the arachnomorphs, you'll find the
Jade deposit in the center of the cave.
When you deliver the
Jade to the runewright, he'll thank you for your help, and he'll make his shop available to you. You'll also earn 100 xp. From this point on, the runewright will sell you runes and glyphs at his shop, and he'll also enchant your weapons and armor with rune / glyph "words," which are a combination of three runes or glyphs, and which can only fit onto weapons and armor that have three slots available.
In its initial state, the runewright's shop will only have lesser runes and glyphs available, and the runewright will only be able to enchant your equipment with eight lesser words. If you invest another 10,000 crowns, then the runewright will add regular runes and glyphs, plus eight regular words. If you invest another 15,000 crowns, then the runewright will add greater runes and glyphs, plus seven greater words. You'll also earn 100 xp for completing the shop.
1 - Upper Mill
2 - Bloodrot Pit