When learning a spell, a magician may choose to accept limitations on her ability to cast that spell. In exchange, the magician will have an easier time resisting the drain caused by the limited spell. These limi- tations on spellcasting come in the form of fetishes—reusable objects with minor enchantments appropriate to the magician’s tradition.
Fetishes are available for sale from talismongers or other magi- cians, and are made for a specific category of spells (combat, detection, and so on). A given fetish can only be used for spells of that category. When the spell is learned, it is attuned to that particular fetish.
Fetishes are available for sale from talismongers or other magi- cians, and are made for a specific category of spells (combat, detection, and so on). A given fetish can only be used for spells of that category. When the spell is learned, it is attuned to that particular fetish.
A magician cannot cast a limited spell without the fetish touch- ing her body. If the fetish is lost, a new one must be tracked down and re-attuned to both the magician and the spell (requiring an Intuition + Magic [5, 1 hour] Extended Test). For examples of items used as fetishes, see Foci, p. 199.
When casting a spell attuned to the fetish, the magician gains +2 dice to resist Drain from casting that spell.
This is the only section I can find which speaks to any relationship between # of spells per # of Fetishes and it seems pretty clear that it is a singular / plural (rather than singular / singular) relationship in the second sentence of the third paragraph (underlined). Meaning that a fetish for a given category of spells can be attuned to any number of spells from that category. The underlined statement in the last sentence further reinforces the idea of multiple spells for one fetish, "a spell attuned to the fetish", not "the spell".
However, if you lose that one fetish, you can't use any of those spells until you find that one fetish. Or obtain a new fetish and attune yourself, and each spell, to the new fetish. By my reading of paragraph 4, that'll be 1 hour of your life, per spell attuned.
On Blood Fetishes, judging from the above, you have to attune the fetish
per limited spell. That means that if you've got 5 combat spells, you have 5 boxes unhealable physical damage, by my reading. I'll grant you, this is subject to individual GM interpretation. Additionally, it's rather vague about the bit on "while the blood fetish is attached". I'm interpreting that to mean you install the fetish into your body, you remove it, it's no longer attuned and would have to be re-attuned, re-inflicting the damage.
EDIT to add quote from Digital Grimoire.
Attuning a blood fetish requires a simple, 10 minute ritual that inflicts 1 box of unresisted physical damage that cannot be healed while the blood fetish is attached.
Never mind how difficult it
should be to get one of these things if you aren't making it yourself, I'm well aware it's only "10F", but generally, tempting powers of evil should come with strings attached in my book. And more than just some physical damage. Blood mages should either be hunting you down or trying to recruit you.