Sorrow Pass is a location in the forest of Nibel, located at the very top of the Valley of the Wind. It is the home of the Sunstone, an object which allows Ori to travel inside Mount Horu to rekindle the final Element of Light needed to save the forest.
Sorrow Pass cannot be accessed until Ori has rekindled the Element of Winds inside the Forlorn Ruins. Once done, the Valley of the Wind becomes flooded with air currents, allowing them to use Kuro's Feather to fly to the top.
Sorrow Pass uses the newly unlocked flows of wind as the main challenge of the area, forcing Ori to utilise most of their skills along with Kuro's Feather to successfully glide around the chambers. During their exploration, Ori will discover an Ancestral Tree that gives them one of their final Skills, the Charge Jump.
Story (Spoilers) Edit
Once at the very top of the Pass, Ori comes before a gigantic crystal that emanates an extreme light. Sein speculates that its glow is the reason that Kuro has kept her distance from this place. The crystal breaks apart and gives the duo the Sunstone, giving them access to their final test within the fires of Horu.
At the same time as their victory, Gumo returns to Swallow's Nest and finds a still deceased Naru amidst the ruins. Using the power of the Light Vessel from the Forlorn Ruins, Gumo successfully revives her and the pair journey towards Horu themselves in the hopes of finding and helping Ori in their task.