Once you reach level 40 with Dehya in Genshin Impact, the resource costs for her next Ascension will require Guiding Light Tetrahedra. To reach level 90 at the peak stage of Ascension, you will need a total of 46 Lightguide Tetrahedra. If you don’t have Aaru Village Guardian Candace or Akademiya Professor Faruzan, chances are you don’t know about this particular character ascension material. Luckily, you need to complete specific puzzles, world quests, or archon quests to acquire this resource, as it is an easily accessible normal boss drop on Sumeru.
Related: How to get Sand Grease Pupa in Genshin Impact
Tetrahedron Farm light guide for Dehya in Genshin Impact
Gamepur screenshot
To obtain Lightguiding Tetrahedra for Dehya in Genshin Impact, you must find and defeat the semi-intransient Matrix of Overseer Network Algorithm, also known as the Tomb Guard of the Desert King. This normal boss can be found in the Dune of Illusion, a notable landmark southeast of Sobek Oasis and southwest of King Deshret’s Mausoleum. As stated above, you don’t have to complete any prerequisites to locate and enter the Tomb Guard’s lair. As long as you follow the main road leading southwest from Aaru Village, you’ll eventually reach the Hypostyle Desert Teleport waypoint and the entrance to the Overseer’s Network Lair Semi-Transitional Network.
Gamepur screenshot
As stated above, you will need 46 Light Guide Tetrahedra to achieve Max Ascension with Dehya in Genshin Impact. Based on our testing, we were able to defeat the Tomb Guard of the Desert King in two and a half minutes at world level 8 with a level 80/90 Ganyu Freeze team, which included Ganyu, Ayaka, Kokomi, and Kazuha. We beat the normal boss twice, receiving three Tetrahedrons of Light Guidance after each fight. Suppose we can receive three in each execution. In this case, farming 46 Light Guide Tetrahedra with endgame gear should take no less than 50 minutes. However, keep in mind the resin cost and the boss respawn time of two minutes.
Source