"Of the gods the King had subjugated, Sanna was considered to be the wisest and most beautiful. She had not remained in the King's realm willingly, but her escape had been prevented by circumstance. She obeyed the king with her words, but not with her soul, and for this goodness she is mourned.
With the war declared, the King took Sanna by force, and lay with her for seven days and seven nights, until the Mother of Those Beneath Us was broken beneath the King. When this was completed, he rose in her blood, and was from then on known as Shormaush Urdal - the Scarlet King.
Seven children were born of Sanna, seven daughters of the Scarlet King emerging from her broken womb. The King saw this, and took them by force to be his brides. Upon the seven brides the King put seven seals, so that they might never die as Sanna had died. With them, the King gave rise to seven ranks of abominations, seven orders of Leviathans, who became his most beloved servants, who march at the front of his war.
Of the seven, this can be said:
...
The fourth bride was A'zieb. She was vast and powerful, and terrible to behold, taking the form of a great beast. Her children were like her, and feared no weapon nor magical spell, for their injuries were healed, and their hides impenetrable.
Her seal was ba, "wrath", for by her hate she was forever bound in conflict.
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The seven brides sealed forever, the legions of their children spread out, and added their strength to the war. Worlds that had resisted the dark gods of the King fell under the weight of ceaseless assault. The roots of the tree rotted, festered with the King's spawn. The Ways became treacherous and poisoned, to where travel could only be made by the blessed, the brave, and the mad. The King's realm grew fat with damned souls, and the Places of Rest waned in strength: Few souls managed to escape that fate, but even in death many still fought." - From Dust and Blood
"The experiment with SCP-682 was most remarkable. Based on multiple Daevite texts, including descriptions from SCP-140 itself, we are reasonably certain that 682 is the offspring of the Fourth Scarlet Bride. If this is true, then SCP-999 is already strong enough to temporarily quell the malevolence of its own eldritch siblings." - From New Job