Greater Glyph of Quen - location, diagram, effects

Greater Glyph of Quen is a Runestone in Witcher 3: Wild Hunt. It is used to improve or add bonus stats to a weapon. Place it in an empty socket

Greater Glyph of Quen - Location

Runewright - ofieri merchant and enchanter found in Upper Mill, Novigrad
The Pellar - a rural holy man that sells runestones, glyphs, and diagrams
Keira Metz - a sorceress that you encounter during one of the main story quest in Velen
Gremist - is a druid and a master alchemist who can be found in Ard Skellig
Vermentino - an armorer that is rescued from the bandits in Toussaint
Freinte Docks - Journeyman armorer that can be found in Toussaint after clearing the area
Mont Crane Castle - armorer appears there once it is cleared from Hanse bandits in Toussaint
Perfumery - a perfume shop that sells alchemical ingredients in Beauclair center
Tulasens Caves - armorer appears once the area is cleared of Hanse bandits
Tourney Grounds - armorer that can be met at Tourney ground in Toussaint
Francollarts - a journeyman armorer in the village close to Beauclair
Hauteville - master-level armorsmith that also sells some materials and gear
Lazare Lafargue - a grandmaster blacksmith and armorer that can make the best witcher gear
Chuchote Cave - a wine merchant that sells alchemical ingredients in a cave

The Pellar - a rural holy man that sells runestones, glyphs, and diagrams
Keira Metz - a sorceress that you encounter during one of the main story quest in Velen
Gremist - is a druid and a master alchemist who can be found in Ard Skellig
Armorer Larvik - an armorer found in Larvik village, Skellige. He sells items and glyphs
Armorer Kaer Trolde - journeyman armorer in the castle of Kaer Trolde
Runewright - ofieri merchant and enchanter found in Upper Mill, Novigrad

Item	Quantity
Glyph of Quen	2

Perfect to increase the effectiveness of Quen sign