lampblack: darvan the mage's house in grudul
essence of dragon: dragon's cave in zorraneon forest
small hammer (cold chisel): gropos castle storeroom
potion of blindness: alchemists shop in cidri
brimstone: ptangia volcano lip?

Hammergard: quest?

Mark says: I'll reward you, something I have crafted from the elements of a
           mountain range, nearby.
Mark says: All I ask is of you is to bring me two parts of the Dragon's Tail.
Mark whispers over to you.
Mark says: Two into one, from a smith molded from twain to the final work.
Mark says: Then will I share with you, the power of the first.


marbles:

blue marble: iceberg
yellow marble: nazca (underground, iirc)
orange marble: meadow between draemar and grudul