Amaranthine

They call themselves "Amaranthine." So that is the politically correct term, not Rivven (as they were dubbed at the beginning of the Emergence).

They are their own distinct species on Earth: not human, not animal, not angel nor demon. They are humanoid but they're not from our Hominidae family, although there are Monkey Clans those would still be just another type of Amaranthine.

For the most part they look very human except for the slit pupils, pointed elvish ears, and pointed nails (considered claws) that they all have. Some Amaranthine have visibly animalistic features like: tails (ex: dogs, wolves), antennae (ex: moths), or horns (ex: deer) but SOME DO NOT. Foxes are a unique case--not born with tails but able to grow MANY depending on their magical strength. Hybrids are an all-together different matter; see kith, kith-kin, crossers.

Significant Powers:
Amaranthine are shape-shifters, however this is a transition between human & animal form rather than the ability to turn into whatever animal they might wish.

Depending on their magical strength, they might be HUGE in animal form. That is inconvenient--it is possible to hold back some power and therefore be smaller.

They are extremely long-lived. The oldest Amaranthine still alive may be Glint Starmark at this point. Amaranthine have been on Earth longer than humans, but not longer than spiritual beings (or regular animals[FACT CHECK]).

They can fly without wings.

Tending: They can touch "souls" with each other and with Reavers. It is not literally their soul--it is some type of inner well of power. More like touching auras or minds? The experience leaves them open to fully understanding each other's personality and from there can begin a transition of power from Reaver to Amaranthine or vise versa. That transition is the "tending". Reavers with very "potent souls" can be enormously tempting to Amaranthine--to the detriment of both. An Amaranthine could become addicted/Broken, a Reaver could be killed by being drained too far. Either outcome could be forced on the other or just be an accident. That is why so many Reavers restrict or fully hide their power with sigil craft and crystals. Tending is take it or leave it--not necessary for life--but no Amaranthine just "leaves it" unless they have had a bad experience.

They are physically stronger than humans, and healthier, and faster, and need less sleep (until they enter a long sleep).

They are all naturally beautiful [fact check]

Origin of their Species
Much is learned in _________ which extensively covers how Glint Starmark became the father of his clan: the Dogs. As well as how the kith and kith-kin came to be. Spoilers ahead:

As for how the first Amaranthine came to be... and how there came to be so many clans of them....

???????????????????????????? More Angel stuff apparently. IDK

Enclaves

Emergence, The Five (which has grown)

Post-emergence

List of every amaranthine ever mentioned and what species they are: