I'll get to Ward Against the Beasts of Legend further below. First, I'd like to outline my view on spirits.
Mentem
I believe that whenever a text mentions "spirits" in the context of Mentem, it actually means "ghosts/animi", and that the ReMe guideline (ward against spirits) actually means "ward against ghosts". I also believe that my opinion is not necessarily the only correct one, only that it is consistent (and other consistent interpretations may be possible). Let me explain my reasoning.
To quote again RoP:M, p. 100:
However, the term [spirit] confuses two quite distinct phenomena. There are the spirits that were created as such [genii], and the spirits that were created as human but have since ceased to be material beings [animi].
The Core book does not clearly distinguish between the two, which makes interpretation hard. Still, I can sort all Mentem spells into the animus/ghost category:
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The MuMe guidelines talk about "mind or spirit".
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There are several spells where "spirit" clearly means animus/ghost: Whispers Through the Black Gate, Lay to Rest the Haunting Spirit, Coerce the Spirits of the Night.
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The ReMe 5 guideline "Control a disembodied spirit" is implemented by Coerce the Spirits of the Night, which targets ghosts.
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For Vision of the Haunting Spirits it's not clear what kind of spirit is meant. I'd argue that the spell is named similar to Lay to Rest the Haunting Spirit, which targets "a ghost or similar spirit" (animus), so that's what was intended. The spell explicitly says that it also targets the spirits of living people, which are also animi. You could argue that it includes both kinds of spirits, I'm just saying it's not a clear case.
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I believe that Ring of Warding Against Spirits also falls into this category - its description begins with "Only ghosts with current Magic Might ...".
The Core book does also talk about genii, such as disease spirits, and there is a very relevant paragraph on p.184:
The Magic realm also encompasses a wide range of spirits. Some are spirits of natural substances, such as water and fire. These are generally classed with elementals, although there is a difference in that elementals are essentially physical, while spirits of the elements are essentially spiritual. [...] this distinction is only of importance to Hermetic magi deciding which Form to use to affect a creature.
This seems to suggest that e.g. fire elementals are affected by Ignem, while fire spirits are affected by Mentem. However, there is no other evidence to support this. The ward guideline from HoH:S says that ReIg wards against "beings associated with Ignem".
Animal
Now on to Animal: You convinced me that the HoH:S guideline and the core guideline for ReAn are different. I'd prefer that the HoH:S guidelines overrule the guidelines from Core, even if it means that Ward Against the Beasts of Legend does not affect a Salamander of Virtue. I'd like an official clarification on that even better.
Why am I ok with that?
- Beasts of Virtue are not affected by a Circle of Beast Warding, because they are not "normal beasts", they are magic entities in the bodies of animals.
- To affect the minds of the many Beasts of Virtue that have Intelligence instead of Cunning, you need Mentem, not Animal. You could still kill it with PeAn, because of it's animal body.
So I'd be prepared to accept that if the rules say that a Salamander of Virtue is aligned with Ignem, then it's more like a fire elemental in an animal body than like an animal, and the Ward Against the Beasts of Legend (based on the HoH:S guideline) would not affect it. The simple rule is that wards targeting beings with Might go by the Form the Might is aligned with. You can still affect its body (and its mind, if it has Cunning) with Animal.