On the small island of Quatrex, in the sea of Unbekannt, there is a remote tribe with a somewhat unique magical tradition.
Since their earliest days, the Quatrexians practiced a fairly typical shamanistic animism which focused on reverence of natural forces and the land. Their primary spellcasters were adepts who might occasionally reach some basic druidic ability, but never, or so seldom as to be the subject of myths, attained druid wildshaping ability. The clerical arts of domains and energy channeling were completely unknown to them.
Their island was in time visited by a group of wizards exploring the uncharted sea. The natives were fascinated and awed by the frightful power these men and women wielded, but while the wizards shared the boons of their abilities, none ever taught the natives how such marvels were attained, rendering them god-like figures in the Quatrexians’ minds.
After the adventurers set up a base camp with many strange and arcane devices, and did some basic good will work with the natives to ameliorate potential conflicts, they tromped off into the jungle from which awesome sounds and lights would emanate. Eventually the meddling wizards awoke a great monster who slept within a mountain. The fiery beast slew most of the wizards in its rampage towards the Quatrexian’s impressive bronze age settlement. In the final half mile, it was halted by the last wizard, who eventually was forced to sacrifice themselves to stop the beast.
The Quatrexians viewed the events through the lens of their beliefs, and interpreted the wizards as powerful spirits of a previously unknown primal force–Arcana. They arrived to reward the Quatrexians for their reverence for the land, but also out of Arcana’s mild jealousy that it’s sibling forces–wind, fire, water, earth, storm, light, dark, and others–were so revered but it was unknown to the pious people. The spirits of Arcana were destroyed as they tried to save the Quatrexians from a monstrous beast of primal fire.
The Quatrexians still revere the primal forces, but now revere Arcana above all for it’s power to harness and call the other forces. They were left with a wealth of arcane resources–potion labs, wondrous item workbenches, a library of spell tomes, magic items of all sorts–but no idea how to use it all.
But they had watched the wizards. They knew not the methods behind the words and motions, but they knew them. They didn’t know how to tap the arcane energy of the multiverse, but they knew it could be done.
They began to copy the motions and incantations of the wizards in their rituals, and slowly, they developed a clerical caste as some began to show the ability to copy the might of the wizards.
Quatrexian Arcana is its own clerical faith. Practitioners have access to the Spell and Magic domain, and their holy symbol is a spellbook into which they have copied “The Tracks of Arcana” (being a culture with no written tradition, they interpret the writing of the “Arcana Spirits” to animal tracks). These are functionally identical to wizard spellbooks, and allow Quatrexian Arcana clerics to cast Anyspell, but do not allow them to prepare wizard spells. Quatrexian Arcanians also have access to any domain which shares a name with a school, subschool, or descriptor of spells, such as Fire, Evil, or Charm.
The vestments and regalia of the priestly caste of the Quatrexians is entirely predicated on the faithful reproduction of wizard garb, and so while many non-priestly Quatrexians still wear the simple linen loin clothes and wraps they always have, priestly vestments are elabourate robes and skirts, often with capes and gaudy jewelry (frequently, but not always, enchanted). Where other priests might wear mitres or other psued0-crowns, the Quatrexian priestly caste wears well-worn wide brimmed pointed hats, frequently embroidered with symbols of the primal forces they choose to focus on.
Quatrexian priests practice a sort of apprenticeship model of theological instruction, with older priests instructing a no more than a handful of pupils. The acolyte-apprentices wear simple linen and woolen robes until they are deemed to have learned the rituals sufficiently that they may be gifted their vestments-magically fabricated luxurious wizard’s robes.
Quatrexian Arcanism dogma is an unusual philosophy of benevolent mastery of nature and the world, and of being at once the sum of and a part of the multiverse, founded on the principles of arcane magic.