With a new twink "Mage" "Blackdragon" get it from Gorgath in Calpheon
If u take the main quest https://bdocodex.com/th/quest/21301/1/?sl=1 u can get the knowledge from Gorgath in Calpheon

KNOWLEDGE ACQUISITION
Obtain from Gorgath

GRADE ACQUISITION
Use Annolisa Rosie to Proc S


AUXILARY MOB PAGES

Gehaku Loot Table

Gehaku Title's

Gehaku Quest's