[Genshin]
Dunno if it is mentioned in game but:

Similar to Lunar Reactions related to the three moons, Stellar Reactions is deeply related to the third descender.

Thank you DK2 for the info

「HSR 4.3」
（Spoiler）

爻光在二相乐园布下「十方光映法界」，以此监视归寂的动向。刃与银狼依照爻光的提议，前往画中世界寻找「贪饕」之口。
Yao Guang had deployed the Deca-Light Reflection Barrier in Planarcadia to monitor Asat Pramad's movements. At Yao Guang's suggestion, Blade and Silver Wolf headed to the World in Canvas to find the maw of Voracity.
在「世界尽头」酒馆，不死途调查发现：假面愚者「未抵」、领航员「我见」与绝灭大君「归寂」之间存在着密不可分的联系。真相揭晓之际，未知的强大力量将不死途带离。
At the \"World's End\" Tavern, Ashveil's investigation uncovered an inextricable connection between the Masked Fool \"Enroute,\" Navigator \"Isee,\" and Lord Ravager \"Asat Pramad.\" At the moment of revelation, an unknown, powerful force swept Ashveil away.
绝灭大君的阴影笼罩二相乐园，躁动的「贪饕」兽蜕威胁着整颗星球的安危。在动身前往神秘的画中世界前，列车组众人在派对车厢为你庆祝与送行。
The shadow of the Lord Ravager loomed over Planarcadia, and the restless Voracity husk threatened the safety of the entire planet. Before you set off for the mysterious World in Canvas, the Express Crew threw a farewell celebration for you in the Party Car.
为调查隆介身上的疑点，姬子邀请隆介对谈，并陪同隆介先后游览星穹列车与绘世学院。隆介坦承自己在调查「毁灭」时罹患「风化诅咒」，希望姬子能告知他十五年前血涂游戏的真相。
To investigate the suspicions surrounding Ryusuke, Himeko invited him for a chat and accompanied him on a tour of the Astral Express and Graphia Academy. Ryusuke confessed that he was afflicted by the Weathering Curse while investigating the Destruction, and hoped Himeko could reveal the truth behind the Bloodstained Games from fifteen years ago.
你与拖欠画稿的虚照同行，来到入画前的最后一站——「渡画泉隐」酒店。你在酒店中四处搜集关于绘世的情报，最终成功召唤「绘世」，并从对方处获知渡往画中世界的方法。
You traveled alongside Nihilux, who was overdue on her artwork, to the final stop before encanvasing — the Inkford Hermitage hotel. You gathered intel about Graphia from all over the hotel, eventually managing to summon \"Graphia\" and learning of the method to enter the World in Canvas.
乘坐绘世的渡船，你与刃、银狼抵达画中的彼岸花原，在此找到「贪饕」之口。为彻底消灭倏忽血肉，刃向其中一跃而下，坠入九死一生的危途。
Aboard Graphia's ferry, you, Blade, and Silver Wolf arrived at the Meadow on the Distant Shore within the canvas and found the maw of Voracity. To obliterate Shuhu's flesh, Blade leaped down into it, plummeting into a perilous path of near-certain death.
于「贪饕」兽口中，刃将倏忽锻囚于己身，涅槃归来。被姬子揭穿伪装后，归寂不再掩饰自身并同时显现于二相乐园多地，宣布要为乐园众生带来迟到的「毁灭」
Within the beastly maw of Voracity, Blade imprisoned Shuhu within his own body, forging his own rebirth. After Himeko exposed his disguise, Asat Pramad cast aside all concealment. Manifesting simultaneously across multiple locations in Planarcadia, he declared he would bring the overdue \"Destruction\" to all life in the arcadia.