A race of star ships created by a race known as the Yiss. The Yiss were around at the start of reality itself and created the multiverse we know of by accident more than design. They emerged out of nothing, before them was nothing. However, just like Conway's Game of Life their little absent-minded creation of reality and it's rules had infinite unforetold consequences the greatest of which was the rise of spontaneous sentient organic life in many universes.After this point their entire life was an act of art, everything they did was designed to cause ripple effects and consequences that were, for them, a statement of beauty and elegance. The Aktarian's were their final act of love and creation, a race of starships that are distinctly non-organic in form yet are reliant upon interaction with other intelligent races in order to reproduce and evolve.
Surprisingly, the Yiss were a delicate people and could no more travel in and out of other universes than any other organic life; their accidental creation was far greater than they - infinitely so. However their command of matter and what we call information theory now was still vast. They observed that the universes they'd created were in fact conscious, living things in their own right. The ships they created were designed to travel between them and within them - to do this, communication turned out to be key.
An Aktarian can communicate with reality on many levels using her ventrali and other surfaces on her wings - they subdivide to infinitesimally fine meshes and membranes thus capable of being vibrated in an infinite variety of ways. This creates a kind of music composed principally of the fundamental forces that permeate all of inter-reality as well as within universes. A bonus, at least for species with ears, in an atmosphere an Aktarian is a consummate musician for that is the only way the ship can generate her voice - it emerges from an angelic orchestration of flutes and wind instruments.
The Yiss tried to create a self sufficient race, reasoning that if such could occur spontaneously, they could create the same. However, this did not work, the depth of information density was plenty but there was a missing spark that resulted in a lifeless child. The only male Aktarian has his own story and was instrumental in the fate of the Yiss as a result. However, they succeeded when they realised that they couldn't create a soul but they could however create a home for one. The first pair of ships could only transit between the universes with brute force and were unable to carry others as passengers. Such travel was painful for these first Aktarians. The first female Aktarian successfully mated with a sentient male from one of the child universes to produce a viable offspring. The equivalent molecule to our DNA proved to be a key organising principle for the sentience and soul of the young ship; the living passion and life energy of the coupling provided the spark that ignited the existence of that soul, yet this potential was only realised when Hrelrana woke the soul up by sun diving with her child through the core of a star. The Yiss never answered the fundamental question of what a soul truly was, no-one ever has since yet life requires this enigmatic essence.
There were relatively few Aktarians in existence, a few thousand but in ordinary circumstances they were immortal and could not be harmed in any child universe. As a result they are also completely peaceful and have no need to express any form of weaponry. The truth is, if you dine on the dense matter in the heart of a star - of any kind or can play with black holes, there is little that would cause physical damage. However, as a race, they are passionate and emotional, partly due to the purpose for which they were conceived. There are few Aktarian's left now, Myelia may be the last. Our universe is a young one at 13 billion years, the Yiss themselves gave their life force to reality at an point before our universe existed. From our view, an Aktarian is close to immortal and they can't be hurt or destroyed within any one universe. They also have no need to fight and have never been known to express or bear weapons.
They are explorers and ambassadors, they are driven by their passions in many ways and seek to bond with partners of any intelligent race that they click with. An individual ship will mate for life with her partner, both lives are immeasurably improved by the contact, such was the intent of the Yiss.
An Aktarian communicates with the Universe she is within via music and vibration, this extends from gravitino and quantum loop fluxes to simple electromagnetic vibrations. In addition, their extreme control of vibrational communication allows them to express a simple voice that a human or other lifeforms can hear. The only problem is that the voice in question sounds more like an exquisite symphony of flutes and pipes, felt as much as heard, this often results in newcomers being unable to follow a simple conversation with an Aktarian at first as they are deeply entranced by their voice.
Quite simply, information density. Even for the people that appear to create the rules there are rules and one of those is about the density of information that any given volume can contain. This variable is quantitatively dependant on the dimensions used but it's finite. Free morphing is physically impossible whilst maintaining the network of information that represents a singular conscious individual as it's the interrelationship that makes up the emergent entity not the parts. Therefore you would have to keep track of an infinite variety of states in order to preserve that individual. Even limited morphing capacity as a cost that outweighs the benefits. An Aktarians wings morph and flex in a specific way for the job they do, their heads can move in a limited fashion for similar reasons, however their agility is such that neck rotation that mammals require is unnecessary. They may pull their head back, arching their neck or dip their head but that's all they're wired for.
Notes on scales and other matters:
Life cycle in the early years: