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At various locations in the world of The Witcher, you'll find circles of stones dedicated to the five signs in the game. The first time that you click on one of these circles, you'll learn the sign. Every time after that, the circle will give you a temporary buff that will increase the intensity of the sign by 50%.

Listed below are the places where you can find the circles of stones.

• Aard:
  
  Witchers' Laboratory, Prologue
  Near the southern cave (The Outskirts of Vizima, #8), Chapter I
  Cultist's Crypt (Sewers, #5), Chapter II
  Southern part of the Fields (Fields, #9), Chapter IV
  Near the chapel (Swamp Cemetery, #8), Chapter V
  
  
• Axii:
  
  Mage's Tower (Swamp Forest, #18), Chapter II
  Western Black Tern Island (Black Tern Island, #10), Chapter IV
  
  
• Igni:
  
  Crypt (The Outskirts of Vizima, #5), Chapter I
  Cultist's Crypt (Sewers, #5), Chapter II
  Elven Ruins (Sewers, #20), Chapter III
  Southern edge of the Fields (Fields, #8), Chapter IV
  Raven's crypt (Swamp Cemetery, #4), Chapter V
  
  
• Quen:
  
  Cave (Swamp Forest, #8), Chapter II
  Crypt (Fields, #3), Chapter IV
  Raven's crypt (Swamp Cemetery, #4), Chapter V
  
  
• Yrden:
  
  Druids' Grove (Swamp Forest, #11), Chapter II
  Final Salamandra Base, Chapter III
  Lakeside (Lakeside, #3), Chapter IV