Phosphora is fast fighter, frequently moving around the battlefield and attacking from a distance with her lightning. She will either shoot electric projectiles through the air or send currents running through the ground. If you get near her, she will try and teleport away, making this fight potentially a long chase.
The good news is, you can also try fighting from a range. Bows in particular work well for this, since you can whittle away her health over time from a distance. Alternatively, use Claws to boost your speed and take her out quickly with melee combos.
Phosphora is quick and evasive, but lacks health. A few good hits will bring her down. Just be ready to catch her.
