Daughters of Elilial

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There were, classically, 7 daughters of Ellialal.  They served as her grounding influence, similar to the function of a paladin.  All of her daughters are known as arch-demons, although they are in fact magically animated with infernal magic and functionally demigoddesses.
The only physical feature common to all seven are the same burning eyes, although they were all generally tall with slightly hawkish features.  Four had firey hair.  The rest possessed a mish-mash of horns, hooves, wings, claws and such.
Arch-demons are not terribly well known in the common era since they have not been seen in three thousand years since the end of the Third Hellwar following the truce forced upon Ellial by forces under Ampophrenon the Gold.  Nonetheless in the circles of the well-educated it is known that all seven were truly frightening to behold, dangerous on the battlefield, and skilled wielders of infernal magic.
As part of her grand plan, before the oncoming planetary alignment, Ellilial intended that her daughters would merge with 7 pre-chosen human girls.  Elillial's cult, the Black Wreath, researched the young girls with great care to ensure similar inclinations and rough personality matches.  For example,  Vadrieny, the youngest, was something of a direct sort with little use of subtlety and a talent for sound based magic was paired with Teal Falconer, who similarly was reluctant to embrace her talents of manipulation as a bard but possessed a keen musical talent.
Something, or someone, interfered with the process of translating the 7 arch-demons into the mortal plane resulting in the deaths of 6 human girls and 6 arch-demons.  Only Teal and Vadrieny survived though an incredible act of love on the part of Teal.  Described as the feeling of being burned alive, the incident was traumatic for both Teal and Vadrieny.  The result, quite anomolous, saw Vadrieny and Teal sharing the same body was studied exhaustively by the Universal Church for some undisclosed, potentially sinister, reason.  Having passed examination after years of poking and prodding, Teal and Vadrieny were given a special Talisman of Absolution, which historically represents that something or someone normally evil has been converted to the side of goodness and light.
Vadrieny emerged from the foiled translation possessing no memories of her former self, other than occasional bits of general trivia which would bubble up from her subconscious.  Vadrieny would later go on to hold quite a grudge against her mother, blaming her for the death of the other arch-demons.
Ellial became severely unstable following the destruction of her mortal anchors, unraveling in fact.  This was only resolved after the Battle of Ninkabi, when Ellilial involuntarily conscripted a new paladin, the Hand of Ellial.
The Universal Church, in a special project under Archpope Justinian, would later use some strange time-based portal mechanism to resurrect Azradeh, to uncertain purpose.  The resurrection project, based explicitly upon readings taken during the study of Vadrieny, produced a similar effect upon Azradeh, who emerged with no memories but a strong bundle of instincts.
Vesk, in Book 14, would send the three Trinity paladins on a quest to discover who had been monkeying around with godhood using the Infinite Order machine buried in Irivoi.  Ellial endorsed the project after reaching a deal with Vesk and Izara, to obtain information from the Irivoi machine.  While Vesk wanted to know who was tampering with godhood (later confirmed to be Archpope Justinian himself, although he denied it) Vesk was also able to use the data to tell Ellial who had killed her daughters.