"Scours the world in search of treasure, but never finds a thing." 

In THIS part, they don't have more than a couple lines. They're similar to the Great Sage (but far less prominent) where they occasionally pop in for an interaction. You first see them in Neksdor town, pondering about who knows what. From the audition lines, I know it doesn't look like they have many lines in total, but I don't want to add lines from future parts so I can see how you embody the character with the normal amount of lines!

Being an explorer, I feel like they'd have a more scholarly voice. Almost like a nerdy type. How I'd recommend you do it, is, even though any vocal range works for this character, I'd make it slightly higher pitched. I'd also add a little nasal undertone, without making it sound stuffed up.