Sara is a buffer who can also deal decent damage with her Burst. Her buffs are quite short in duration (6s) so you may have to use her for quick swaps. She is best used at C2 so you won't have to use a Charged Attack after her Skill for the Crowfeather and the buff. At C6, she provides +60% Electro CRIT DMG to characters she buffed.
Best Artifacts
(2) Elemental Burst DMG +20%
(4) Using an Elemental Burst increases all party members' ATK by 20% for 12s. This effect cannot stack.
For providing 20% ATK buff to the team if no one else has it.
(2) Energy Recharge +20%
(4) Increases Elemental Burst DMG by 25% of Energy Recharge. A maximum of 75% bonus DMG can be obtained in this way.
For buffing her Burst DMG.
Best Stats

Sands
Energy Recharge / ATK%

Goblet
Electro DMG Bonus

Circlet
CRIT Rate / CRIT DMG
Substats
Energy Recharge / CRIT Rate / CRIT DMG / ATK%
info
*Prioritize Energy Recharge substat first until requirements are met
Best Weapons
Base ATK674
CRIT Rate+22.1%
SourceWish
Echoing Ballad
Increases CRIT DMG by 20~40%. Hits have a 60~100% chance to inflict a small AoE attack, dealing 125% Physical ATK DMG. Can only occur once every 4~2s.High Base ATK is good for her buff, and having both CRIT Rate and CRIT DMG in one weapon is awesome.
Base ATK608
Energy Recharge+55.1%
SourceEvent Wish
The Parting Refrain
A part of the "Millennial Movement" that wanders amidst the winds.
Increases Elemental Mastery by 60~120.
When the Elemental Skills or Elemental Bursts of the character wielding this weapon hit opponents, that character gains a Sigil of Remembrance. This effect can be triggered once every 0.2s and can be triggered even if said character is not on the field.
When you possess 4 Sigils of Remembrance, all of them will be consumed and all nearby party members will obtain the "Millennial Movement: Farewell Song" effect for 12s.
"Millennial Movement: Farewell Song" increases Elemental Mastery by 100~200 and increases ATK by 20~40%. Once this effect is triggered, you will not gain Sigils of Remembrance for 20s.
Of the many effects of the "Millennial Movement," buffs of the same type will not stack.For team buffing.
Base ATK565
Energy Recharge+30.6%
SourceEvent
Radiance of the Deeps
Has three states, Evengleam, Afterglow, and Dawnblaze, which increase DMG dealt by 6%/10%/14%~12%/20%/28% respectively. When attacks hit opponents, this weapon will switch to the next state. This weapon can change states once every 7s. The character equipping this weapon can still trigger the state switch while not on the field.Base ATK565
ATK+27.6%
SourceEvent Wish
Watatsumi Wavewalker
For every point of the entire party's combined maximum Energy capacity, the Elemental Burst DMG of the character equipping this weapon is increased by 0.12~0.24%. A maximum of 40~80% increased Elemental Burst DMG can be achieved this way.Great for Sara's Burst DMG.
Base ATK565
ATK+27.6%
SourceEvent Wish
Oppidan Ambush
While the character equipped with this weapon is in the party but not on the field, their DMG increases by 2~4% every second up to a max of 20~40%. When the character is on the field for more than 4s, the aforementioned DMG buff decreases by 4~8% per second until it reaches 0%.Base ATK565
Energy Recharge+30.6%
SourceWish
Composed
After dealing damage to an opponent with an Elemental Skill, the skill has a 40~80% chance to end its own CD. Can only occur once every 30~16s.Base ATK565
ATK+27.6%
SourceForging
Flower-Feather Song
For every party member from Natlan or who has a different Elemental Type from the equipping character, the equipping character gains 4.8~9.6% increased ATK. When there are no less than 3 of the aforementioned characters, the equipping character gains 24~48 Elemental Mastery.