I was listening to Dragons of the Air: An Account of Extinct Flying Reptiles by H. G. Seele and a vis source emerged.
In Bavaria, near Solenhofen, there is a layer of white, lithographic limestone which is deep within the earth. It contains the bones of small wyverns, perhaps three feet across. Their wings contain Auram vis. These wyverns lack the scorpion sting common to their tribe, and have something almost like a hand at the front to of their wings. Perhaps they are a hybrid of the wyvern and dragon types?
The wings are strange, and characters skilled in Animal will notice their peculiarity. There are only so many forms of wing, and we can categorise the endoskeletal ones by comparing them to human hands. Bats have a webbing between four fingers, with a thumb extending from the front of the wing. This form is often followed in dragons, which is why they, too, have a claw at the front of their wings, and their wings that have obvious internal bone supports. Birds have three sets of phalanges within their wing creating a plane. These parallel the second, third and fourth human fingers. Some dragons have these sorts of wings: they are generally feathered.
The Bavarian wyverns, the deepest buried source of Auram known to the Order, differ. They are not as reptilian as the batwinged kind of dragon. They have extended skulls and gracile skeletons like birds, but with conical teeth in their elongated beaks. They are not, however, winged like the feathered serpents. They have a three fingered claw on the front of each wing. The wing’s span is supported by a ridiculously enlarged fourth finger at its fore-edge.
Story hooks
No Hermetic wizard has, yet, used a ritual to create one of these dragons. The Tremere would like to, because they are always looking for odd animals to reuse as weapons and tools. The Bjornaer would also like to, because they want to understand how such strange wings work.
Auram vis is generally used to alter weather, but there is one group who prize it in military applications. There is a small lineage of lightning magi who dwell in the Alps, and are rumoured to be the core of House Guernicus’s defacto standing army, made up of the hoplite stations throughout the order.
Games From Folktales 
Statistics:
Bavarian Wyverns
Magic Might: 1 (Animal)
Characteristics: Cun +2, Per +2, Pre +1, Com 0, Str -2, Sta +1, Dex +1, Qik +5
Size: –2
Season: Spring
Virtues and Flaws: Magic Animal; Improved Characteristics, Latent Magical Ability, Keen Vision
Magic Qualities and Inferiorities: Miniature, Susceptible to Deprivation, Improved Soak, 3 x Minor Virtue (Improved Characteristics, Latent Magic Ability, Keen Vision).*
3 minor Qualities not used. The temptation is to spend them on Virtues that personalize each wyvern. One might be a Berserker (Minor General virtue) with Improved Soak (+4 Soak, +2 minor qualities) and other might have Enchanting Music (Major Supernatural) or a power like the venom of the Sictalis (Greater Power, Realms of Power: Magic p.74).
Personality Traits: Curious +3, Flocking +2*
* Bavarian wyverns hunt and fight in trained groups.
Combat: Fangs: Init +5, Attack +9, Defense +11, Damage +2
Soak: +2 (light scales and feathers)
Fatigue Levels: OK, –1, –5, Unconscious
Wound Penalties: –1 (1–3), –3 (4–6), –5 (7–9), Incapacitated (10–12), Dead (13+)
Abilities: Animal Handling 2 (care for flock-mates), (Area) Lore 5 (local)*, Athletics 5 (flight), Awareness 4 (threats), Brawl 5 (fangs), Hunt 5 (prey), Craft 2 (simple tools), Survival 2 (caves)
*Takes some time to develop this after de-extinction.
Powers:
Flight (natural ability), 0 points. Can fly, almost like a bird.
Vis: 1 Auram in bones. Note that some individuals may have the Personal Vis Source virtue.
Source: Based on the scitalis in Realms of Power : Magic (page 74) but the rework is severe.
Appearance: The Bavarian wyvern is an archaeopteryx. In the real world this is a transitional fossil between dinosaurs and birds. They are the size of birds, have comparatively long tails, and have wings that have rounded outer edges. Bavarian wyverns are generally black, although magic used to de-extinct them may create colours via magus’s sigils. There’s a sufficiently strong Lamarckian element to reproduction in Mythic Europe that a covenant’s population of Bavarian wyverns, between sigil imprint, Aura warping, and neoteny through domestication, may look little like the originals. The Latent Magic Ability is there to slot a power in that suits each magus if they are taken as familiars.
To make the wyverns even more common, take away their Magic Might so they are simply animals. This reduces the vis cost to create a breeding population.
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