The battle can be won easily by using Odin. The Magic Lamp can even be recharged nearby. Otherwise, the three can be easily defeated by repeated use of the Bard'sRequiem and multi-target attacks such as summons, though one should only use water, wind, or non-elemental attacks to ensure that all three fall together.
[view·edit·purge]In Greek mythology, the Nereids are sea nymphs (female spirits of sea waters), the fifty daughters of Nereus and Doris, sisters to Nerites. They were distinct from the mermaid-like Sirens. They often accompany Poseidon and can be friendly and helpful to sailors fighting perilous storms.