Quien da este conocimiento por que el npc indicado no lo da y tan solo gaste en vano 401 de energia

Npc Clarkster 401 dostluk yap al.

https://bdocodex.com/tr/npc/50405/1/

Can be acquired at Clarkster (node manager of karanda); 400 amity recquired. You can remove the knowledge and acquire it again and again until you reach S.