Upon completing Olberic's story, Erhardt can be found in Wellspring. The Battle-tested Blade can be bought or stolen from him here.

How do you get the purple chest in lizardmen den?

Lizardmen's Den

As soon as you climb the stairs, head right and open the chest for 2,000 Leaves. Continue north, then move to the right to find a hidden passage, leading to a purple chest (Silver-filled Pouch).

How old is Olberic?

Olberic is 35 years old, making him the oldest traveler.