By Drinking the blood of the Most Ancient you gain power that is beyond compare.
*You gain the immortal power of an Antediluvian; a powerful vampire with few equals. You are capable of feats of strength and speed far beyond even the greatest humans, and are almost indestructible. Sunlight is merely painful to you(though deadly to your progeny) and Fire and crosses may be seen as slight annoyances.
*You may create progeny, which may in turn create progeny. Each step dilutes their power slightly, ensuring that none would be your equal. Differences will be highlighted if necessary. To do so, you need only feed a recently deceased person a mere drop of your blood. Though keep in mind the less blood you give them, the hungrier they will be.
*Choose a type of vampire, such as the classic Dracula, or a hopping vampire, or even something like Alucard(Hellsing). You gain all of their power, as well as logical extrapolations of their powers up to continent destroying levels. You may also learnthe abilities of other kinds of vampires (again, with conceivable extrapolations and increased power) or create entirely new powers with minimal effort. Your progeny intuit your chosen archetypes powers, and require teachers to learn other kinds powers.
*Your body is fueled by blood. While you are able to eat (and enjoy) food, it provides you no sustenance. Human blood now tastes like the finest wine, the best chocolate, and a rich steak somehow mixed pleasantly on your tongue.
*You may store near endless amounts of blood for later use inside yourself. Despite this, you arent under some kind of "hyper pressurization" or something. The blood simply exists inside you, somewhere.
*By feeding a small amount of blood to a human, you may grant them a fraction of your power. These "Ghouls" may easily go out in sunlight, and suffer none of the weaknesses of vampires. Additionally, as long as you feed them blood monthly they do not age. As a trade off, they must be kept hooked on your blood, or their powers will wane. Your progeny may also do this.