Niella

"Bring me some silver talents from the Sirjuka Gallery. The talent glyph box I'll give you in return may contain a level 58 or 60 uncommon glyph."

Location
is in Allemantheia hanging around with the npc vendors in the Plaza of Arcane Symposium

Niella is a Silver Talent Token Merchant These items are not longer in the game. Tooltip says: "Spend Silver Galleons", if you have some lying around.