Arma Caeli live within a strict hierarchy. Simply put, the strong are revered, and there are certain bloodlines that have stayed on the top for centuries. Other than a common family name, in warriors, the length of ones hair can signify the prowess as a fighter - it is common for their hair to be cut upon a lost fight, as a sort of trophy.
Arma Caeli Ranks

Lord of Night and Dusk
One of the two current highest ranking Arma Caeli. As such, often very overworked, and they take turns commanding. Like Day and Night, they depend on each other, only really being able to rest when their counterpart is awake. It was decided in order to keep the peace, there should be a representative of both day and night cycle at the same rank present.
This rank is unattainable.

Lady of Day and Dawn
One of the two current highest ranking Arma Caeli. As such, often very overworked, and they take turns commanding. Like Day and Night, they depend on each other, only really being able to rest when their counterpart is awake. It was decided in order to keep the peace, there should be a representative of both day and night cycle at the same rank present.
This rank is unattainable.
Commander
Commanders of the day, dawn, night and dusk. These four will take over if something were to happen to their higher ups, and as such are second in command. Each bloodline has decided on their representative by whichever criteria they deem fit. Their identities are currently unknown.
This rank is unattainable for now, but may be available through events later.
Champion
These few Arma Caeli per bloodline take up spots as exceptional people. They reached this rank by accompishing great feats in battle. A champion can be challenged for their spot at any time, but they may also retire at their own discretion if they find someone to take their place. Often times, champions will take apprentices for this reason alone to keep their influence under control and from falling into random hands. Generally a champion is well versed in both magical and physical combat with a very well rounded skillset.
You may freely make your Arma Caeli a champion, but canonically, only around 50 champions exist at a time.

Guardian
An unlimited number, and one of the four highest ranks a regular Arma Caeli can feasably reach. Guardians tend to excel at defense and durability. They are often tasked with protecting Armanite while champions, commanders and soldiers go out to conquer new realms. They may accompany them on these journeys as well, but their primary concern is the guarding of Armanite, and considered an honor. Guardians are led by and must be approved by the Commander of Dusk.
You may freely make your Arma Caeli a guardian.

Healer
An unlimited number, and one of the four highest ranks a regular Arma Caeli can feasably reach. Healers tend to excel at restorative, regenerative and supportive magic. They are needed both at the base and on the front, so healers have pretty free reign on where they wish to assist others. Healers are led by and must be approved by the Commander of Day.
You may freely make your Arma Caeli a healer.

Archmage
An unlimited number, and one of the four highest ranks a regular Arma Caeli can feasably reach. Archmages tend to excel at any kind of spellcasting and magic, but focus mostly on offensive and manipulation magic. They are tasked with upkeeping barriers around Armanite, and monitoring changes in the Reflection. As those closest to the flow of vis and magic, they are often advisors for others as well. Archmages are led by and must be approved by the Commander of Dawn.
You may freely make your Arma Caeli an archmage.

Warlord
An unlimited number, and one of the four highest ranks a regular Arma Caeli can feasably reach. Warlords are known for their explosive physical power and skill with many weapons. While a few of them tend to stay back to fend off foes, most are sent out on missions across realms as their offensive abilities are most needed there. Warlords are led by and must be approved by the Commander of Night.
You may freely make your Arma Caeli a warlord.
Soldier
Soldiers who fight and protect under the command of a Guardian or higher individual. They are the largest part of the fighting forces of the Arma Caeli by far. Amongst soldiers, there may be exceptional talents who just never sought to rise in ranks.
You may freely make your Arma Caeli a soldier.
Citizen
Those who prefer to not join the strict hierarchy and stay unranked, or are too weak to make it in the fighting force. They are generally expected to stay within Armanite, but some have defied this and built something for themselves elsewhere.
You may freely make your Arma Caeli a citizen.