The specific nature of Talia is unknown, and beyond a proclivity to appear naked to incite the baser natures of men, her exact modus operandi is unknown. What is known, however, is that she is a Demon and she is working with a faction of the Order. She also provides them with their magic drug.
What most people don't know is that the drug she gives them is actually from her blood. Specifically it is the plasma portion of the blood.
Using a simple centrifuge, her blood is separated, and the plasma can then be injected into a properly prepared vessel. It gives the user heightened reflexes but at a cost. It litterally burns them from the inside out, and eventually kills then.
Most users of this drug will not live past their 25th birthday.