Archangel

"Archangels are fierce. They're absolute. They're Heaven's most terrifying weapon."

- Castiel talking about the Archangels

The Archangels are the first creations of the Abrahamic God, the primordial and divine beings who were created before the [Birth of Existence] and the [Dawn of Creation].

They are only beneath their Creator in terms of powers and authority, and co-ranked as the 2nd most powerful entities in both existence and nonexistence.

Overview
"Israeli angels known for carrying out the Divine Will. There are many theories about the role of archangels, but as they're strong members of Heaven's hierarchy, the general theory is that their role is to convey the Divine Will to humans. It is said they command nine armies of angels who fight against the army of demons that tries to guide humans down to hell. In ancient times, the archangels were considered the top of the divine hierarchy, but in the Middle Ages other classes above the archangels were born, such as Seraphims and Virtues, which knocked them down the list."

- Compendium about the Archangels

The Archangels are among the eighth sphere, making them second in the third hierarchy in the nine orders of angels in Christian teachings.

Archangels are one of the few bodies of angels that contact those on the material plane directly and are the ministers and messengers between God and mankind. There is a dispute on whether famous archangels such as Michael and Gabriel are the same class as the "plain" archangels, who in the Kabbalah and in the Bible are called "Bene Elohim" (meaning "children of God"), or belong to a completely different order known as "Rav-Malakhim" or "Malakhim-Panav," who are the angels that stand before the lord himself.

According to some texts, archangels are also the primary warrior race of angels and are known to be at constant war with the fallen angels. It is even suggested that Lucifer was an archangel before his fall from grace.

Summary
The Archangels are the most ancient and powerful Angels created by God before the [Birth of Existence] and the [Dawn of Creation], known for being the primordial personifications and embodiments of different forces/aspects of creation.

It is said that when they were born, their sheer brilliance created the Ein Sof - The Outside which is the Primordial In-Between Realm of Everything and Nothing - from the primordial emptiness that existed before their creation. Other than that, no one truly knows their history or origins, about where, when, or how they came to be, as they have been in existence for eons before the concepts of "history" or "information" came into existence.

Characteristics
The Archangels are primordial entities who exist in a stage beyond comprehension, encompassing all the aspects, concepts, elements, and ideas that they embody. Despite this, even if everything and anything associated with the forces they embody are completely destroyed beyond nonexistence, they still possess their all-power and nigh-omnipotent powers. This is because these forces originated from them, not the opposite, and they can simply recreate or even create a new aspect, concept, or primordial force to embody as easy as breathing.

Due to their immense powers, they have been forbidden by God to appear in the three first levels of Creation in their true forms, prompting them to create corporeal forms of themselves using an infinitesimal portion of their power. Because of this, they aren't able to access their full powers while in their corporeal form, and thus often appear as mere shadows of their true selves, possessing only a microscopic portion of around 1/1000100 of what they estimated to be "a single atom in comparison to the entirety of infinity".

Their corporeal forms may vary from one Archangel to another, as they are mere the appearance they had chosen on a whim. Because of this, their appearance often varies from one to another. Regardless, no matter what form they take, they always possess a supernatural beauty exceptionally greater than even the most beautiful of gods, capable of capturing the hearts and minds of all those who look upon them disregarding their gender, sexual orientation, and relationship.

They are powerful beyond the comprehension of gods, monsters, and mortals alike. They possess absolute divine authorities, and raw, infinite and limitless powers over the numerous domains of both existence and nonexistence. Even their weakest powers are infinitely powerful beyond the imagination of any being. Because of this, the primordial gods and buddhas who know of their existence have come to call them the "Absolute Powers" as there is virtually no way to defeat an Archangel without the assistance of other Archangels.

According to Gautama Buddha, no matter how many qualitative steps one takes, one can never possibly reach their level of existence even if they are in their weakest of moment, even if they spend an eternity trying to. They can alter and destroy any and all matter at a quantum scale, manipulating their given concepts and laws which govern over all of reality and beyond, as well as reform even if they suffer absolute conceptual death.

In addition, the Archangels are capable of birthing entire multiverses, as well as erasing them effortlessly.

Quote
"I think you just got the wrong idea, Śakra. We are not gods or buddhas, neither are we truly spirits or Angels. In truth, we might not even passable to be called "beings". We are patterns. We are ideas. We are wave functions. We are the echoes of the primordial origins of everything and nothing, and so much more... Our existence is absolute and eternal, beyond the comprehension of all gods and buddhas. We have ruled over all of existence, even since long before its birth and we will continue to do so until we get bored, end all of existence, shut the light and close the door as we exist. And you will never have any true power over any of us."

- Gabriel telling Indra about the nature of the Archangels

Trivia

 * The Archangels are based on the Endless from DC Vertigo.
 * The Archangels, more or less, are similar to the Aeons of Gnosticism.
 * Aeons are emanations or concepts that fragment themselves from the Singularity of Monad after eternities of contemplation/silence.