Blood Magic

Blood magic is the practice of using blood as fuel for esoteric effects. There are many things that can be used as magical fuel, but none are quite as energy-dense and accessible as blood, death, or sex. <ref>You may be focusing too much on 'blood' as the central component of this.
1. Can i drink the blood of an Other and gain a ability related to the other,like,drinking an goblin's blood,can i grow claws?
This is more of a Host thing.

2) can i enhance other kind of magics with blood,for instance elementalists and ogre mages can throw fireballs,can i create a spell that enchance my fireball with blood magic?
Blood Mages aren't really fireball types. If you did have fireballs, you could use blood magic to empower what you're doing, as you could with any practice.
Blood Mages are practitioners of the material and of sacrifice. Blood is the most common currency they work with, but it's not the only currency or focus. You could make Death or deaths be the currency, or sex, or life/lives.
Being practitioners of the material, they tend to like working with items. Think of them as being the guys who think "There are powerful items in the world, how do we make more?" - a sword wielded by an ancient hero who kills a thousand enemies ends up becoming powerful in its own right. But if they have a sword and use it to ritually kill a thousand people, can they get a similar kind of power? Implements are really potent things, but what if we gamed the system and used rituals and large amounts of power to try and brute force the system and have multiple implements or pseudo-implements, that we can then transfer power between, on a necessary basis? Part of the reason for items is that they tend to make better vessels for the kind of power we're talking about than the practitioner themselves.
And yes, because they work with this power as a currency, they can spend it on making their fireball more intense. More likely, however, they're playing a Dauntless sort of game.

3. Can i control people and Others by using their blood like marionettes?
Not so much. You could use blood to empower practices that did, however.

4. what kind of familiars and implements would be good for blood mage?
Depends on the blood mage. Blood magic familiars tend to be either the result of investment and sacrifice or the result of taking X from things. If you make a habit of taking every last drop of someone's vitality from their body, and doing this on a regular basis, then spirits flow in to fill the void and spirits start to get accustomed to going to X place at Y time to get in on the action. Then you have pale Others moved by spirits and by some combination of spiritual energy and their own, old motivations, feral and craving what they had taken from them- closer to being ghouls than anything else. You can get tongueless, eyeless things that creep around blindly, seeing with their own version of the Sight, and things without skin.
Flipping things around, if you're using blood to empower items, then that blood has a character to it. The type of blood matters. Ditto for Deaths, ditto for lives. Somewhere along the line, if your own personality doesn't assert itself over this degree of power with its own personality, then the power wins, and you have a box that's taken over its host or develops enough of a form to have an associated human-ish shape that manifests around it or carries it around.

5)are there such a thing as spirits of blood? if so,what can i do if i let one of them possess me?
There are, but again, I think you're thinking of 'blood' as too much of a focus or central component here. In this case it'd be a sanguine spirit. Letting this spirit possess you would be more of a Host thing than a Blood magic thing.

6)can i enhance mundane items with Blood? a knife that is sharper or a gun hit with more accuracy?
Yes. This would be a blood magic thing, as it's material and the blood would come as the result of sacrifice. Like Dauntless from Worm, you could even put in more blood over long periods of time to keep improving the item.

7)Can i make someone my hypnotized slave by having them drink my blood? Not a blood magic thing. - A Few questions about Blood Magic in Pact. </ref> . Of course, using blood comes with risks; using one's own leaves them weakened, while using other's may bring lots of bad karma. Those who primarily utilize blood are known as Blood Mages.

Methodology

Blood magic is a price and material oriented school, meaning there is a lot of sacrificing oneself and storing it for later use. Typically it is used to empower other types of magic, or to aid in the maturation of a tool. <ref>Pact Dice: The Practice - Wbow Version</ref>

When harvesting blood from others, the practitioner must create and follow strict conditions on who, how, and why that other's blood may be harvested. Failure to do so will yield a karmic backlash. Examples include harvesting only from monsters, only from those who willingly offers their blood, or only from those who attacked them first.

Users of Blood

Blake Thorburn - attract a ghost, empower a silence rune

Alexis, Tyler, Tiffany - heal Blake

Maggie Holt - empower a ghost

References

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