The area of known existence is known as The Tower, this name was coined by the Meldutians as a metaphor to describe the layout of all known existence. There is no evidence to suggest there are more towers but it is possible.
The Living Universe is where the majority of life can be found. This layer contains three different universes within it, surrounding a section of space where a solitary planet can be found.
The first universe thrives with technology, used to prolong the average person’s life. Most inhabitants resemble humans on earth. However most have some alteration in accordance to their planet's climate, meaning there is a wide variation of humans in this universe.
The second universe has high usage with biologically altering micromechanics which the average human would see as magic. The dominant race here are beings called Ropipolitans; they have much thicker skin (dark shades of blue). They also are more suited to combat and have aggressive tendencies. These beings are similar to humans in the fact that they share a similar skeletal system and that they need the basic requirements to live.
The third universe is not unified in nature and is close to war with itself. There are several thousand factions of people, each fighting for their own reasons and goals. This universe contains the most diverse collection of sentient beings that cannot be found anywhere else. Humans or Ropipolitans that are found here have either deserted their own kind or have been stranded by an unexpected circumstance (e.g. wormhole). There is a high mix or technological awareness and magic within this universe that is used both for the purposes of preservation and advancement as well as for war purposes.
All three universes are positioned at even intervals from each other, but also at different elevations if studied from a 3D perspective. At the centre of these points lies a conduit of power that runs and preserves ‘The Tower’. This conduit is surrounded by a planet that is ruled by the Hyperion Royal Family. This planet is protected by a shield generated by the nexus itself, capable of preventing all outsiders from entering.
Meldutia is a planet that sits at the centre of existence, ruled by Queen Hyperia (longest known ruler of the planet). The people of this planet (Meldutians) live in harmony, using a perfect blend of natural technology and matter manipulation to survive. These people resemble humans however due to the nature of the planet (situated around a nexus of power) they are capable of living up to 10 thousand years (earth years).
The people are capable of producing all the necessities they need for themselves and anything they don't have can be procured from someone else in exchange for knowledge. From this it's noticeable that knowledge is valued highly in this civilisation.
Apart from one's knowledge, other elements that people value highly are your ability to fight, using conventional Medieval-Style weaponry and one's ability to sing. In this civilisation singing allows a person to commune better with the nexus, allowing a person to learn more about the world (like a dimensional internet of sorts). Singing in this regard is similar to resonating with the very fabric of reality. Meldutians believe fighting by the sword is the quickest way to commune with this nexus. So fighting one another is seen not as a brutish act but rather a 'holy' art in itself.
Just to make the question a bit more specific. Is it possible for a civilisation outlined above to have a medieval-like hierarchy with all they know about life and the universes around them?
It's worth noting that this civilisation had already confirmed the existence of other universes (3 to be precise) that revolves around the centre of existence (Meldutia).
Gods used to roam the world long ago but the Meldutians of the past convinced them to leave to a higher plane of existence. Gods, at least in this question, is a catch-all term to explain such a high level of technology that it appears to be magic. So all these godly beings are certainly killable despite their apparent immortality.
Time on Meldutia moves slower than usual. For example 1 year on Meldutia may equal 500 Earth Years.