Ethios: Valiant Plume Saga is a 3D action-adventure game. You play as a party of heroes, each with their own unique abilities that allow them to traverse the world and overcome a wide array of obstacles and enemies.
There's a place that's essentially a mountain made of Thunderheads. It has a number of tunnels snaking through it, but do yourself a favor and go around instead. You don't go through the Gravecast Corridor.