With every new Genshin Impact update, we get new characters in the game, and to ascend them, we need to farm their ascension materials. One of them is the Light Guiding Tetrahedron which is an ascension material required to ascend Dehya.
As per the in-game description, it is "a core component obtained via defeating a mysterious ruin machine." Light Guiding Tetrahedron can be found in the desert area of Sumeru, and here is the exact location to farm it.
Genshin Impact: Light Guiding Tetrahedron Farming Location
You can get Light Guiding Tetrahedron by beating Algorithm Of Semi-Intransient Matrix Of Overseer Network, the World Boss found in The Dune of Elusion in the desert area of Sumeru, and here is the exact location of the boss marked on the Genshin Impact Interactive Map by HoYoLab.
You will need to first teleport to the waypoint near The Dune of Elusion, and there you can follow the path marked in the map above, and the boss will be waiting for you to fight in the ruin.
To beat the Algorithm Of Semi-Intransient Matrix Of Overseer Network quickly, we recommend you have a team consisting of at least one Dendro and Electro character to utilize the damage bonus given by the Quicken elemental reaction when he enters the invisible stage. In addition to this, we also recommend you give a slot to a shield character in the team to avoid damage given by the boss, and the last slot can be given to a pyro character to achieve the maximum damage.
You can travel fast from one location to another by using Teleport Waypoints and the Statue of Seven to collect them quickly. In addition to this, make sure that your HP is enough to fight the enemies as well, as you might encounter some while exploring.