Vayne has the most unlikeable and despicable biography of all characters

To hunt demons and learn their lore, she pledged herself to Frey, saw her perform the dark magic and participated in those rituals herself.

Then once Frey turned into a demonic wolf to save Vayne, Vayne kills her mentor because she felt "deceived".

Except what kind of deceit is that ? Vayne knew that her mentor was a dark sorcerer and once she invokes a curse on herself to save them both, Vayne stabs Frey in the back because her petty pride was hurt.

Like she killed her de facto mother and lord because she felt slighted by her being too secretive, this is more vile and dishonourable than things they do in Noxus lol