Properly written "Star Seed." Sailor Moon reference, specifically the Stars season (year
5). A tiny, glowing crystal that represents the vital force and purity of its owner. Galaxia (the main villainess) is after these for galactic domination, but ordinary
Star Seeds have very little shine and quickly turn
black when separated from their owners. Said owners then become "Phage Senshi," who must be wounded critically and healed by Eternal Sailor Moon'
s second-tier healing
magic.
Active
Star Seeds do not fade to
black upon removal from their hosts, and are sources of great power. As far as we know, only a planet's Senshi possess these. It is possible to live without a Star Seed, if you are given strong enough magic (as in Galaxia's bracelets). Active
Star Seeds can apparently also take on different forms; Galaxia's Star Seed became a young girl who called herself ChibiChibi, for example.