Do you think she killed Vayne's family? She is a witch, an evil shadow witch to boot.
For those of you who don't know, Amoline is Annie's mother, and Vayne's family was killed by a witch when she was a little girl.
I don't think Riot would need to change much (If anything) to tie the two lores together. With the new Annie remake, I can't think of a better time to retcon a little old lore, in exchange for something awesome like Vayne/Annie interactions.
The benefits of this:
- Vayne and Annie are rivals now, like Rengar/Khazix. We all love this type of stuff!
- Amoline, The Shadow Witch may become a new champion.
- We get the varied (As in not another young, attractive woman with giant boobs xD) female champion people have been asking for. Not necessarily a warty old witch, but something more like Flemeth:

Relevant Lore:
In the time shortly before the League, there were those within the sinister city-state of Noxus who did not agree with the evils perpetrated by the Noxian High Command. The High Command had just put down a coup attempt from the self-proclaimed Crown Prince Raschallion, and a crack down on any form of dissent against the new government was underway. These political and social outcasts, known as the Gray Order, sought to leave their neighbors in peace as they pursued dark arcane knowledge. The leaders of this outcast society were a married couple: Gregori Hastur, the Gray Warlock, and his wife Amoline, the Shadow Witch. Together they led an exodus of magicians and other intelligentsia from Noxus, resettling their followers beyond the Great Barrier to the northern reaches of the unforgiving Voodoo Lands. Though survival was a challenge at times, the Gray Order's colony managed to thrive in a land where so many others would have failed.
The world is not always as civilized as people might think. There are still those who would follow the blackest paths of magic and become corrupted by the darker powers that flow through Runeterra. Shauna Vayne knows this fact well. As a young privileged girl in the heart of Demacia's elite, her father tried to convince her of the constabulary's ever-vigilant eye. Young and naive, she truly believed that her world was one of perfect safety, until one night, when a twisted witch took interest in her father. The malevolent woman overcame her father's conciliar guard, then tortured her family before murdering them. The young Shauna escaped only by hiding herself and then fleeing once the hag had departed, plagued by the screams of her loved ones as she ran. A burning hatred was born in her that day, one that could never be denied.