Ultreia is a point 'n click adventure game about a mystical world populated by robots. Underneath the skin of the landscape are caves filled by huge creatures living in the darkness. The journey will take Nymo through the large and phantasmagoric city of Mount St-Troy, to space, and beyond.

A little robot Nymo, fueled by a great loss, becomes a pilgrim and decides to cross a wild world to find the meaning of life and death. He also has a mysterious goal: to avenge his father's death.