Blood speakers

[Ryan_Singer]

Sounds perfectly acceptable balance-wise, though it does largely make the ability to pre-sacrifice moot.

It makes death sacrifice and moderate and severe sacrifice much more important than minor sacrifice, which will only really happen mid-combat.

[Belial666]

It's pretty simple guys;

[-3] Blood Sorcery
You can cast spells by using blood instead of your will. This ability is identical to Evocation - or what passes for Evocation in the setting - but with the following changes;
Blood Price: cast quick spells using physical stress instead of mental stress.
Blood Focus: instead of a physical focus crafted by magic, you use blood taken in advance. You get enchanted item slots as normal. Each enchanted item slot can be used to create an item associated with blood sorcery or to ritually store blood. You draw blood in a ritual manner by inflicting consequences - you can store one consequence per slot. Ritually stored blood can be stored for a number of days equal to your Lore.
Blood Master: Stored blood is used in this way; you may use stored consequences to increase your spell Power, each consequence giving a bonus equal to its shifts. You may use a number of consequences equal to your power specialization in said element. Blood Sorcery cannot increase your control - but extra power from it does not need to be controlled either.
[-2] Blood Ritual
Unlike the quicker blood sorcery, blood ritual has no limit on how many consequences you may use on a spell. However, you must use Thaumaturgy rules for spellcasting, summoning the power slowly.