Wind Magical Archer (Ardella)

Ardella the Wind Magical Archer is probably the best farmable damage dealer for Raid in Summoners War where she can express herself at her best.
Her first skill comes with an integrated Attack Break and her Passive guarantees a 25% bonus in critical rate plus a critical damage that scales up basing on HP loss, and her second skill suggest a Speedy Nuker build becuse Light Arrow scales with attack speed. Thus bring us thiking she can reduce Raid run times significantly, especially if your team is stable enough to make room for her in place of Colleen (Fire Harpu).

Note that she's not a R5 starter, but more an advanced unit for raid, she's squishy and requires a good healer to survive, like Wind Skydancer (Chasun),
so if you're new to R4/R5 runs consider building another DPS like Water Kung-Fu Girl (Xiao Lin).

Wind Magical Archer is also helpful in Giant B10 dungeon, where she can work as a good DPS but only if you don't have better DD units.

Ardella Suggested Runes

Early Nuker - Fatal/Blade (Atk%/Crit R%/Atk%)
DPS R5 - Rage/Blade (Spd/CD%/Atk%) with an eye for HP% and Atk% substats
Sustainable DPS in R5 - Vampire/Revenge (Spd/CD%/Atk%) looking for Def% and Atk% substats