Treasure hunting...?

[Niwashi]

Finding the maps is a solo activity for gathering classes, but then using the map to find treasure (and fight the mobs guarding that treasure) is a group activity for combat classes. So anyone who finds a map needs to put a group together to do the actual treasure-hunting part.

So while your Warrior wouldn't find maps (unless you diversify further to pick up a Disciple of the Land class), he can still go treasure hunting with friends who have maps. It's the sort of thing often done with FC-mates or sometimes through Party Finder.

EDIT:
Oh, after checking that guide, I guess I was wrong about maps necessarily needing a group for the treasure hunting. Those are just the types of maps I've heard about the most, but it depends on the map type whether you can collect the treasure solo or need a group for it. My previous comment still holds true for at least some of the maps, and it is something I've seen FCs set up recurring groups for.