The grail is the key to saving them. Which moon has locked within her.
The Outer Senshi also guarded the three Talismans, the key to the appearance of Sailor Saturn, the bringer of death. When the three Talismans were brought together, Saturn would bring down her glaive. In Sailor Moon S, the mission of the Outer Senshi was to prevent these Talismans from being reunited, so that Sailor Saturn could not bring about the Silence.
there eyes are pretty