This mod is basically tweaks 3 of the vampire powers so that they can be used in the late game. The changes are the following:

Vampiric Drain - With these changes the player now does damage similar to NPC vampires.

stage 1 - 8 damage (was 2)
stage 2 - 10 damage (was 3)
stage 3 - 12 damage (was 4)
stage 4 - 15 damage (was 5)

Vampire Seduction - This was way too low and didn't scale at all, now the player will be able to use this ability past level 10.

Magnitude changed to 40 (was 8!)
*can be boosted to 50 with illusion master of minds perk
*will top out at 60 if you have the necromage perk

Vampire Thrall Spell - This Ability will now work past level 20 and the power is determined by the stage of vampirism you are.

stage 1 - 24 magnitude (was 6)
stage 2 - 36 magnitude (was 13)
stage 3 - 48 magnitude
stage 4 - 60 magnitude