As most of you will already know, Meridia's beacon is a random spawn which prompts a quest called the "The Break of Dawn."
This quest is really quite fun and the Daedric Artefact "Dawnbreaker" is one of the most satisfying weapons in the game.
However, something I found ridiculous is the fact that even if you are a vampire... you can still do the quest.
Meridia loathes the undead. Bad, bad, bad.