Trine 4 The Nightmare Prince

Prince Selius (introduced in Nine Parchments) had aptitude for magic, but misused his father's spellbook, releasing the shadow of his soul and destroying his family's castle. His parents therefore sent him away to the Astral Academy, but the Academy wizards were unable to control the prince's nightmare magic and he eventually escapes. Amadeus the wizard, Pontius the knight and Zoya the thief are tasked by the Academy headmaster to bring Selius back. At first the trio tries to convince him to return, but Selius refuses, revealing that the Academy simply locked him in the dungeons. His unstable shadow magic causes his own nightmares, those of the heroes, and even the inhabitants of the wilderness to manifest physically, and Selius flees.

While tracking the prince, the trio helps the creatures of the wilderness in fighting their nightmares and in return three nature spirits give them a potion of light, which should help Selius—it does, but it also empowers Selius's shadow, since the brighter the light, the deeper the shadow it casts. The trio assists Selius in fighting his shadow; ultimately, the prince is able to use the power of light to seal his shadow back into his soul. His magic now stabilized, he agrees to return to the Astral Academy.