Elder Sources

Jade Fragment
'Fleece a crowd of Carnival-goers' under "Steal from the gullible" at the Flit as it also provides Rats. Excess Jade can be turned into Whispered Secrets at Coil 1 of the Labyrinth of Tigers. Also, consider a loop through Coil 2 of the Labyrinth of Tigers, picking up Jade from 'The escaping leopard'. Or grind in Watchmaker's Hill. 'The seal of the hooded hawk' Conclusion of New Expeditions in the Forgotten Quarter can provide 2000 Jade in addition to 1 Puzzling Map and 3 Touching Love Story

Relic of the Third City
'The fellow in the corner' provides 11 relics for a cost of 10 Rostygold in Spite. Obtain Jade Fragments and convert them into Relics, but this might be inefficient.

Mystery of the Elder Continent
Convert from Relic of the Third City or Vision of the Surface, [2] from 'Walk along the beach' form the Hunter's Keep.

Presbyterate Passphrase
Convert from Mystery of the Elder Continent.

Antique Mystery
Either steal these with thefts of particular character in the Flit, or convert from Passphrases. sells for 12 Echoes, 50 pence

Primaeval Hint
Use your Trade Secret for one of this and Searing Enigma, or get them through 'giving up' last option from The case of the fidgeting writer or with a rare success when laying to Zee. You can get this from converting 5 Antique Mysteries, but this is unrecommended. 'An inscribed diamond' Conclusion of New Expeditions in the Forgotten Quarter can provide one, with 1 Ostentatious Diamond as bonus for high-watchful characters. sells for 62 Echoes, 50 pence

Elemental Secret
Get this from Noman's Progress 5.