Man, the dungeoneer is strong!
A shadow elf Dungeoneer Fighter with dual wielding (never seen before in the history of fantasy ) would be devastating at level 10
So now that I've read all the abilities of the Dungeoneer I'm also imagining a caster that can summon walls (Ice, Iron, or Stone) as means of giving the Dungeoneer the terrain they need and also controlling the monsters as well. Good synergy there.