To complete the For A Sweeter Future quest in Genshin Impact, you must speak to Mestwin in the west garden of Downtown Novokitezhgrad, then catch a Kristallfly and use them to channel their light into Dim Crystal Floras. This will make the plant bloom, which is what Mestwin has been struggling with. For completing this mission, you will get two Exquisite Chests and one Precious Chest in Genshin Impact.
Lead three Seelies back to their Seelie court in Crystal-Tree Grotto to get a Luxurious Chest as a reward.
To trigger the For A Sweeter Future quest in Genshin Impact, teleport to the western Teleport Waypoint in Downtown Novokitezhgrad, then go further west to the large garden. Once there, speak to Mestwin the Domovoy and agree to help him.
This will start the For A Sweeter Future quest, and you will get the following task: Find a Kristallfly for Mestwin (0/3).
However, although the mission tells you to find a Kristallfly for Mestwin, you actually need to make the Dim Crystal Flora blooms.
First, you must capture Kristallflies using Luminous Lamp Crystal. You can do so by buildinf a Luminous Lamp Crystal Prime Ice Construct, then taking the Lamp Crystal to lure in the Kristallfly.
After you catch the Kristallfly, return to the garden and find a Dim Crystal Flora. Press Channel light to move the Kristallfly into the flower and make it bloom.
You must do this three times to complete the For A Sweeter Future quest in Genshin Impact and make Mestwin happy.
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