What storyline started good but got ruined later?
For me, the Heretics storyline had so much potential at first. The idea of vampire-witches returning with Lily sounded genuinely creepy and different from previous villains, especially because they had history with Stefan and Damon. But later it started feeling rushed and messy, and most of the Heretics barely got enough development to feel important. It could’ve been one of the darkest and most emotional storylines in the show but it ended up feeling kind of wasted.