There are five levels of vampire types in my world which fall upon a pyramid scale. The most powerful - Level A's, or purebloods - are at the very tip, and near impossible to kill, sometimes even with a hunter weapon. They can survive even being cut into pieces or decapitated. They also are the only vampire capable of turning others.
The types below that are the aristocrats at Level B, the common vampire at Level C, and ex-humans at Level D. The level below that is technically off the chart, known as the End Level. They're the ones who will attack indiscriminately, and without any solid sense of self. They're the humans who were turned, but didn't complete the cycle.
[Which he had a risk of falling to. However over time, and after consuming a great deal of the life blood of a pure blood, he's at a whole different level.]