Tenfold Dungeon The UnderdarkHead to a location hidden within the depths of your realm with The Underdark Tenfold Dungeon set, a place shrouded in mystery and intrigue where shadows hold sway over the souls that dare to venture within. Survive the cavernous drop, navigate the bridge of roots, cross the cavern lake and more with 12 durable, double sided locations, featuring 1 x 1 grids discreetly layered into the environment.