A while ago I finished SOA season 4, the song of the end is really addicting. Here it is (no spoilers):
https://www.youtube.com/watch?v=scTqpfL9WMA
https://www.youtube.com/watch?v=scTqpfL9WMA
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you