Genshin Impact features several types of domains, including the Domains of Forgery, where you can farm weapon Ascension materials. Each region has one Domain of Forgery with a unique enemy lineup. To claim rewards, you'll need to spend 20 Original Resin or one Condensed Resin after battle.
The Secret to Farming Artifacts in Genshin Impact
Each Forgery Domain will only drop one type of weapon Ascension material each day of the week, so you’ll have to wait until the material you need is in rotation. If you want to Ascend weapons quickly, I recommend farming on Sundays, when all the materials are available.
Located west of Wolvendom, Cecilia Garden allows players to farm for three sets of weapon Ascension materials. Rewards rotate each day of the week (except Sunday, when you can choose which materials to farm), so be sure to time your farming schedule for the right days.
Each reward level is unlocked at Adventure Ranks 16, 21, 30, and 40. If you're having trouble farming the higher domains, consider joining Co-op.