As the first 5-Star Fontaine character introduced in Genshin Impact, Lyney needs Ascension materials solely from Fontaine. Lyney doesn’t need anything found underwater, so you don’t need to use the diving mechanic or explore two floors of caves.
Genshin Impact: Lynette Talent Guide | Genshin Impact: Lynette Constellation Guide | Genshin Impact: Lyney Talent Guide
For the most part, you can stay in the southern part of Fontaine close to the Sumeru border. Unless you want to fully explore while collecting materials, you shouldn’t have to use the Aquabus to get around. Instead, summon the Waverider and stay around the Emperor of Fire and Iron’s area.
Currently, Lyney is the only character who uses the Rainbow Rose for Ascension. This includes Weapons too, no Weapon uses the Rainbow Rose for Ascension. This might make it easier to ascend Lyney since nothing else will compete for the Rainbow Rose, but this is balanced by the fact that no shops currently sell the Rainbow Rose.
Fortunately, this isn’t another Scarab situation. The Rainbow Rose is relatively easy to farm, appearing throughout Fontaine. However, they’re most concentrated in the Court of Fontaine area, specifically in the northwest mountains overlooking the Court and the northeast following the Aquabus route.
For the most efficient farming, make sure to equip the Seed Dispensary when you harvest Rainbow Roses. This will give you both the Rainbow Rose and its seeds. You can plant the seeds using the Luxuriant Glebe plot in your Serenitea Pot. Each rose takes a little under 3 days to grow – 2 days and 22 hours to be exact. You can garden up to eight flowers at a time if you have both Luxuriant Glebe plots.
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