How/why they became vampires
"Curious about the werewolves transformations, Klaus and Henrik (the youngest Mikaelson)went to spy on them one night during a full moon. Unfortunately, their presence was ultimately discovered by the werewolves, who were unable to control themselves and ended up mauling Henrik to death.
Overwhelmed by the loss of another child, Mikael and Esther were desperate to cast a spell that would protect the family from more deaths. After Ayana refused to help them, citing the fact that
the Spiritsand
Nature itself would not stand for such an imbalance, Mikael begged his wife Esther to do something using her powers as a witch. Esther obeyed Mikael's wishes and performed a variation of
the Immortality Spell created by
Qetsiyah a powerful witch, which involved calling upon the
sun for life and the eternal
white oak tree for
immortality.
He then offered his children wine laced with the doppelgnger
Tatia's enchanted blood and killed them soon after by driving his sword through their hearts. The Spirits of Nature, in order to try to maintain the balance, turned nature against them; the sun became their enemy, the flowers that grew at the base of the white oak tree,
vervain, caused them pain upon contact and prevented
compulsion, and the white oak tree that granted them immortality became the one thing on earth that could take it away. Mikael and his family later burned down the white oak tree to prevent it ever being used against them, but not before Mikael had secretly carved a stake.
But, they soon learned with all this power came a terrible hunger, and none felt it more then Niklaus. Once Klaus had killed a human, Mikael and the rest of the family found out that he was actually a werewolf, born of an affair Esther had with a werewolf villager named Ansel. Upon seeing Klaus' first transformation as a true hybrid"
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