The research notes of Keryx, student of blood magic.

Blood Magic-chapter 1-The Choice

At the start of this research it should be understood that everyone can not do this unless they make the choice. You must place upon yourself a gift and a curse. Markings must be placed upon your body that will allow you to feel, sense and otherwise control the power of blood. I had chosen this magic, as I would not receive the blessings of Lolth, for power. The curse is simple... A "second-form" is given to you. The form is more or less, weak and feeble and to add to that, is a surfacer creature. You also will have a thirst for blood, that if not quenched, you will stay in the form until it is quenched. You are to be very careful with this curse in drow society and keep your self in check with your own blood supply, as I do. I keep it for my magic and to quench the unrelenting thirst. Every 6 to 10 hours you will want to drink at least a vial of blood. You will also gain a language that seems, rather foreign in the underdark. A language of the surfacer creatures, will be known to you.

Blood Magic-Chapter 2-Harnessing

Once you have taken on the markings of the curse, you will notice your heightened senses but the more difficult to notice is your power over blood and it's properties. You will notice you can draw magic from blood of any kind. The thirst of blood is a small price to pay, for slowly learning to harness magic that others could not dream of doing. Materializing objects, out of nothing it would seem. Have raw power shoot from your body, at your will. Being able to change your form at will. It is all magic created from the blood you drink, and the blood that is around you. All one must do is drink blood, or focus on some blood and absorb it's power. You can do so many things with the blood of your enemies.

Blood Magic-Chapter 3-Creature Binding

Something unusual to this brand of magic is the ability to force a creature into your servitude. You take a vial of blood from a living creature, being sure to keep them alive. Then you have them in your power, as soon as you perform this ritual. You make on the ground, markings, similar to the ones that were placed on your body, and poor the blood of the create onto the markings. You then, use the language that you had learned from chapter one, on the creature's blood, commanding the blood, using the language. Command and insist that the creature is yours to the blood. Then the creature will reform with the blood and be bound to you, until you wish it gone, or release it from being bound to you, in which case the creature is released and dies, immediately after. Until then the creature lives on, forever.