Nomadic people (Greek: νομάδες, nomádes, "those who let pasture herds") are communities of people who move from one place to another, rather than settling permanently in one location. There are an estimated 30-40 million nomads in the world. Many cultures have traditionally been nomadic, but traditional nomadic behavior is increasingly rare in industrialized countries. Nomadic cultures are discussed in three categories according to economic specialization: hunter-gatherers, pastoral nomads, and "peripatetic nomads". Nomadic hunting and gathering, following seasonally available wild plants and game, is by far the oldest human subsistence method. Pastoralists raise herds, driving them or moving with them, in patterns that normally avoid depleting pastures beyond their ability to recover. Peripatetic nomads, who offer the skills of a craft or trade to those they travel among, are most common in industrialized nations.

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Hermit crabs are decapod crustaceans Paguroidea. They are not closely related to true crabsermit crabs are quite commonly seen in the intertidal pool: for example, in tide pools. Most species have long, soft abdomens which are protected from predators by a salvaged empty seashell carried on the crab's back, into which the crab's whole body can retract. Most frequently hermit crabs use the shells of sea snails; the tip of the hermit crab's abdomen is adapted to clasp strongly onto the columella of the snail shell. As the hermit crab grows in size, it has to find a larger shell and abandon the previous one. This habit of living in a second hand shell gives rise to the popular name "hermit crab", by analogy to a hermit who lives alone. Of about five hundred known species, most are aquatic and live in varying depths of saltwater, from shallow reefs and shorelines to deep sea bottoms. However, tropical areas host some terrestrials. The king crabs in the family Lithodidae were formerly considered to be derived hermit crabs, but are now placed in a separate superfamily.

(Credits to Wikipedia. For more info go to www.wikipedia.org).

I remember reading something like this somewhere after I was writing all the details of a dream that I had so I could turn it into a story and I bumped into nomads and when I searched for the opposite somewhere said something about astros and crab hermits which was more like a "virtual stereotype" definition so I decided to use it with my own original twist which involves dimensions and demons, making it a bit more fantasy. Nomads are us, normal humans who live in this dimension and do whatever they want and have knowledge of their surroundings. They have total control of their decisions and what they want to study and do in life (all this characterictics come in hand in hand with what a true nomad is) then we have the opposite of them. The astros: humans in a different dimension who unlike nomads have no control of their decisions and what they want to do in life, even their jobs are already instructed to them as soon as they are born. The astro's dimension is more closer to a dangerous dimension where weird demons and creatures live who need to leave their dimension cause it's too contaminated for them not taking care of it so they invade both astros and nomads dimensions every now and then, contaminating both of them too in their way. The dream I had was very weird but interesting and every single character for the story was originally in my dream. I just hope people get to enjoy it 'cause it did took me a lot of time and research for it to make sense, heheh~ :)