Vaynes Lore is actually decent in terms of writing

Before I get crucified let em explain myself

Although I dont like the new Vayne as a character I can respect the direction that Riot is taking with her. Sure they could have made her a tragic hero like batman but instead they chose this. Yes while Vayne does fight evil she doesn't do it for the sake of good or justice but for the sake of revenge. She has lost her way in her own hate that she is truly no better than the creatures she hunts, just like they hurt and murder their victims for the thrill of it, she now does too. In my opinion it really highlights how badly her parents death affected her and why she she kills Frey (RIP, Frey was the best and shouldn't have died QQ). At the end of the day Vayne isnt really meant to be liked or a tragic hero, Vayne is just tragic in general and shows how one sighted and damaged she is as a person. The day she killed Frey really highlighted how monsters are not as black and white as they seem so good job riot. But still Vayne is a total dick for killing Frey