Thaumaturgy is the closely guarded form of blood magic practiced by the vampiric clan Tremere.
Associated Powers:
Level 1: Fire a Blood Bolt that deals decent Burn damage to the target. Gain access to the Selfgib, Blood Trap, Identification, and Blood to Water Runes.
Level 2: Fire a Blood Bolt that deals decent Burn damage to the target. Gain access to the Blood Wall Rune.
Level 3: Fire a Blood Bolt that deals decent Burn damage to the target. Gain the ability to use Blood Shield. Gain access to the Blood Guardian and Question Runes.
Level 4: Using Thaumaturgy on a target causes them to throw up, stunning them momentarily. Gain access to the Gargoyle Rune.
Level 5: Using Thaumaturgy on a target causes them to throw up, stunning them momentarily. Gain access to the Curse and Teleport Runes.
Blood Magic
To use Blood Magic, one can either take a chance and create a random rune and hope for the best, or go through the appropriate hoops and hurdles to acquire an Arcane Tome. Generally, only the Tremere Chantry, located in the National Theatre has a store of Arcane Tomes. One can expect having to be subjected to a blood bond in exchange for the closely guarded secrets of House Tremere at best, or being hunted down and exterminated for being a leak of those secrets at worse.
Once you have an arcane tome, simply hold it in-hand and press the Thaumaturgy button again - this time you'll be able to select exactly which Rune it is you wish to draw.