Do note that from whence forth, this flashback takes a gory, dark and twisted turn. Read at your own peril. Not suitable for those below eighteen.
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Islinda knew that Azula was not a saint, she was a demon after all, and she witnessed the chilling extent of her cruelty. Azula did not spare any. Not women nor children. In her defense, those children would turn out to be monsters just as their fathers before them and there will not be more birth with the females gone. The only difference was that their death was quick and painless. That was as far as her compassion ran.
Azula was as smart as she was mad. She took no prisoners and her death was swift and calculated. Not to mention that this time of the night when all should be asleep aided in her plan. Most of the Fae she had killed, especially the females and children, died in their sleep.