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Lilac Educator's Knowledge
Cosmetic set. Dragonflight. You purchase this from in Dornogal; it is contained in the , which you get in exchange for one or 9750 .
The 
Lilac Educator's Knowledge is a transmog item purchased from Osidion in Dornogal for either one 
Earth-Encrusted Gem or 
9750 Resonance Crystals.
Purchase from Osidion
Travel to Dornogal and find the vendor Osidion. Purchase the Lilac Educator's Knowledge by exchanging either one Earth-Encrusted Gem or 9750 Resonance Crystals.