Little bit expensive than market place , but you can buy roshar samshir at Ossa Dila Valencia and heat that weapon , you can get trace of memory around 1-4 (Master 5 Processing)

Obtained from Valencia Excavation node;

Missing link -
Obtained from node
Pilgrim's Sanctum - Humility - ExcavationRequired: 80 Energy from Tarik (Pilgrim's Sanctum - Humility Node Manager)

Можно добыть с узла Святилище паломников: Скромность. Принцип такой же как и с порошком варвара

Thanks guys! Added that info into the database.

Does also drop from some Monster in Basilisk Den. I just did not figure out which one yet.

Node de extração em Duvencrune https://ibb.co/tYJXkxc

So I've been farming these guys no drops... is there any other way to get these?