Then when stamina is depleted, his speed reduced to that of a human with stamina.
A vampire is immortal!
So he CAN NOT die from falling from mountains ( only from weapons ), but can also float down on unsuspecting victoms ( like Kain from Blood Omen )
As vampire lord, You would look down from the heights of a mountain, and can leap from it; ( in first or second person ) gliding over the cities and vallies with dragon like wings ( a more demonic look ).
While sprinting, one can leap from a high place and quickly strike his enemy down, ( no perk required ) while a Matrix and or slow motion kill cam shows this awesome attack ( randomly ), and leap great distances.
You can run and leap from the ground on top of houses and from house to house.
All arcane magic cost 50% less to cast and regenerate 150% AUTOMATICLY, and are more destructive; taking 75% of life from ALL...45% from dragons.
If disarmed, claw attacks are as leathal as a Daedric sword.
These are the gifts of a the undead.

So make your choice what you shall be!