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/th/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.

If all planets stars and galaxies allign you MAY get 50 amity at best. Go rest at bed until you have 400 energy and wave(f5) until 400 amity.