The Thyphlo Ruins are a location from The Legend of Zelda: Breath of the Wild. It is located in the Great Hyrule Forest region of Hyrule. The ruins are completely dark, forcing Link to use light from torches or Daruk's Protection to find his way to the Shrine.
The Thyphlo Ruins are an ancient ruins that, for reasons unknown, has a veil of jet-black fog hovering over the vicinity. This fog is so impregnable that Link cannot possibly count on the light of the Sun to guide him through here. The ruins also feature bogs that Link can sink in to and drown if he is not careful while making his way through the ruins to find the Ketoh Wawai Shrine.
Within this mix of ruins and forest, Link can run across Wolves, Stalkoblins, Fire Keese, Keese Swarms, and a lone Hinox who guards the way to the Ketoh Wawai Shrine. The only person who resided here was Sheikah Monk Ketoh Wawai until Link discovered him. On the outside of the Thyphlo Ruins and pitch-black forest, there is an enormous bog that surrounds it and a bridge that leads to the entrance of the forest at the west-most point.