I AM THE EDGE!!!
You cast spells by letting some of your blood as a sacrifice. This blood manifests into a spell. The act of bloodletting won’t cause a Wound if it’s done with a small blade, but can make you Shaken if done wrong (Failure on Magic Test). If you wish, you can sacrifice more blood to fuel the spell. Each Wound you deal to yourself (it’s a free action) gives you +2 to the Blood Magic roll. You can do the same by sacrificing the life force of others, but it requires a Multiple Action Penalty during combat. This Trapping allows you to replace the Attribute Arcane Background: Magic has with Vigor.