Repulsive Practice
3 points (Dark Ages Mage)
Your magic is not clean, nor is it harmless. Your
spells require bloodletting, pain, odd or unsettling
components (such as rotting flesh) or other unpleasant
conditions. Although you aren't required to hurt
others to cast magic, you should work to figure out
what exactly your spells do entail and let the Storyteller
judge whether they are nasty enough to justify
this Flaw. If your methods are ever discovered, you
can expect the Church to take a very dim view.
Source: Dark Ages Mage - Pg.92