The blood mage is a student of forbidden ancient magic that depends less on mana than on the pure essence of life. Their spells are ugly weapons, but powerful in the extreme, able to control the wills of others. (Dragon Age: Origin Manual)

Blood Magic
All spells cost zero Magicka to cast. Caster loses 10% Health per spell casted. All vanilla healing spells and potions are reduce to only 10% effectiveness.

Blood Magic: Sacrifice
Follower loses 20% Health. Caster gains 200% health from Follower's lost health. Creatures without blood are immune.

Blood Magic: Wound
All enemies are stun for 10 seconds and loses 100 points of Health. Creatures without blood are immune

Blood Magic: Control
Target become friendly for 40 seconds. Creatures without blood are immune.

Blood Magic: Slave
Target becomes friendly for 20 seconds. Target blows up if killed dealing 75% damage base on target's max health, Creatures without blood are immune.

Blood Magic: Grave Robber
Each nearby corpses or creatures will heal the caster for 10% Health. Creatures nearby take damage base on the caster's max health. Creatures without blood are immune.

Blood Magic: Hemorrhage
All enemies near the caster are stun for 10 seconds and loses 100 points of Health. Creatures without blood are immune.

Blood Magic: Possession
Target becomes friendly for 20 seconds and gains bonus to attack power. If target dies the dremora possessing the target will escape. Creatures without blood are immune.  

Blood Magic: Offering
Nearby followers loses 20% Health while Caster gains 200% health from their lost health. Creatures without blood are immune.

Blood Magic: Influence
Depending on how the target is affected by Blood Control, Slave, or Possession. Influence will spread out to nearby targets. Creatures without blood are immune.

Installation/Uninstallation:

To install the mod just drag the data folder into your Skyrim data folder or use NMM for an easier
install/uninstall.

To uninstall the mod make sure to deactivate the Blood Magic power in game first.

Delete in your data folder:
Dragon Age Origin Blood Magic.esp
Dragon Age Origin Blood Magic.BSA

Credits:
Bethesda Skyrim/Creation Kit
Nexusmods Skyrim
Skyrim Modding community
EA Dragon Age series
Dragon Age: Origins - Awakening Prima Strategy Guide

Requires:
Latest Skyrim patch 1.9

Changes:

v1.0
Optimize and removed reduntant codes in all scripts.
Made Grave Robber harm nearby creatures again.

v0.09a
Fix Blood Wound and Blood Hemorrhage hopefully. Using them before sometimes caused npc to be stuck.

v0.09
Casting spells will cost 10% of current health while Blood Magic is active
Blood Magic Powers are either target location or target actor now
Added four new blood magic powers: Hemorrhage, Possession, Offering, Influence
Changed Grave Robber to only restoring health
Changed Sacrifice to damage 20% health from followers

v0.08
All Blood Magics are given to player at the start/load of a game and are equipable in either hands
Enemies no longer fall down while effected by Blood Wound
Casting spells will cost 10% health while Blood Magic is active
Changed all blood magics back to projectile
Blood Magic must be active to use the other Blood Magics

v0.07
Dragon Age Origin no longer use loose script files packaged into a bsa
Added Blood Slave spell from dragon age 2
Changed all blood spells discriptions

v0.06
Added a new plugin to allow idle animations to play while casting blood magic spells(warning animations playing is still buggy. Use one or the other not both plugins)
Blood Wound no longer paralyzes creatures who are immune to the paralyze effect
All Blood Magic area of effect spells have been widen from 10 to 15
Raised health drain from 2 pts to 10 pts when casting spells

v0.05
Changed all blood magic spells to use the voice power slot
Changed Blood Drain to Dragon Age II Blood Magic: Grave Robber
All Vanilla healing spells and potions have changed to only have 10% effectiveness
Lower health drain from 5 pts to 2 pts when casting spells

v0.04
Changes how the spells work they now fire on location and target instead of firing with projectile.

v0.03
Added a blood drain spell - it absorbs ten health points a second from targets and last five seconds
Fixed Blood Control now does the fully 20 second control effect

v0.02
If you have v0.01 delete the esp file
Grammer fix to the mod file esp
On loading game player will auto get the spell tome to learn blood magic
Made it so blood wound only effects hostile targets