Quickest way is to exit the oassis, and head NE. You'll find a zone line halfway accross the map, at the very northen edge.
Once in the next zone, head roughly north untill you come accross a large stone arch, with a collector and a gaggle of hydras patrolling. Let them do their thing, go into the arch and beyond. curve to the north untill you find windriders, then some wooden platforms, and finaly scarabs. You can't miss him.
I recall seeing other material crafters around. One right outside the Sanitarium for the less esoteric stuff like parchment, steel, and the like. The other one is in the Ascalon foothills, close to the travellers vale zone line. He's at the foot of one of those god shrines. He could craft some rare stuff, like glass vials, ink and clay bricks.
I hope that helps
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