The Keepers are a group of humans, Dhampirs, and Moroi who live away from modern society. Usually they live in the secluded woods. The name of the group, "The Keepers" is a play on words about how the group "keeps" the old ways of the Moroi.
They refer to the follow as:
Moroi and Dhampirs living in modern society: "The Tainted Ones"
Strigoi: "The Lost"
Alchemists: "Lily-girl" or "Lily-boy"
The Keepers have a strong belief in the old ways that the Moroi government was run. Long ago, as the dhampir said, it was a battle to the death for anyone who wanted to be king or queen of the Moroi. When the Moroi became more modern, they adapted the modern way of electing their monarch: through elections and tests.