The information shared by Mytour below has been confirmed to be accurate by at least 2 different leakers at this current time. However, there's still about 2 weeks until miHoYo officially tests patch 4.2, so they still have time to reconsider.
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At the current time (September 15, 2023), here's what we've just learned about Furina's skill set:
Skill SetFurina seems to be a character capable of inflicting significant damage at CM0.
Furina possesses effects with 500 layers. When healing, layers accumulate to enhance recovery efficiency. When taking damage, Furina accumulates layers to increase elemental damage by 0.xx% for team members (unlike Mona's debuff on enemies). Each 1% HP healed or lost counts as 1 layer, and these effects apply to the entire team.
Elemental Skill: Summons a small 'pet' that may allow Furina to deal damage from outside the field.
Ultimate Skill: Currently believed to increase damage and attach the Hydro element. However, these could also be effects from combat talents, activated upon use of the ultimate.
Furina's Destiny- CM1: Upon using the ultimate, immediately gain 150 layers of effects. Cap increases to 650 layers.
- CM2: Transform Furina into a hyper carry with even greater damage-dealing capabilities.
- CM4: Increase energy recharge capability.
- CM6: Double the speed of effect layer accumulation, with no change to the layer cap.
If this information is accurate, Furina can utilize both TDV sets in the Abyss: Domains of Sin, depending on your preferred build. Using the Marechausse Hunter set, Furina stands to deal damage on the field, while with the Golden Harbinger Ensemble, the Water Deity simply needs to deploy her Elemental Skill and exit the field.


The effectiveness of these builds depends on the stats granted by Furina's constellation levels, so we'll have to wait for the beta version to determine. Mytour will closely monitor her development process and provide you with updates as soon as possible.
