How do I get Dispel Barrier Level 3 in Avernum 2: Crystal Souls?

How do I get Dispel Barrier Level 3 in Avernum 2: Crystal Souls? - Closeup of part of wet steel fence covered with clear pure transparent raindrops

In Avernum 2: Crystal Souls, I know that I'm supposed to get Dispel Barrier Level 3 from Pyrn's Barrier Tower, but I've tried everything and I still can't get it.

How do I get Dispel Barrier Level 3?






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How do I get Dispel Barrier Level 3 in Avernum 2: Crystal Souls? - Curious funny black Kunekune piglet walking on dry hay in enclosure and looking at camera
How do I get Dispel Barrier Level 3 in Avernum 2: Crystal Souls? - Ground level of crop stylish male adolescent in contemporary wear with cap sitting on barrier leaning on hand and looking at camera in evening
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Let's play Avernum 2 [223] Dispel barrier 3




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