The acoustic passage between 4:12 - 5:08 plus the distorted riff that follows are one of the most sinister sounding riffs that Mikael ever wrote! The acoustic one sounds even more eerie and dirty on the demo version than final output, since they solely used electric guitars for that entirety of that recording: https://youtu.be/dt7deWPhGUQ?t=2m36s
the riffing, melodies and lyrics are all top notch, it really grabs you from the beggining. Although it seems quite hard to assimilate the whole song, I'll listen whenever I lack inspiration to do tasks. This song is just so win that I feel awesome just by listening to it!
it makes me sad that Mikael will probably never write stuff like this again 
But you know hes getting old and his throat and etc, I just always love this guy :]
Seriously watch their show at rock am ring 2014
Best song in the entire human race. Brings so many memories to me, like a special "effect" that only this song can create. I think it's the atmosphere. No one can make something like this again, not even Åkerfeldt himself.
That riff, which starts at 13:38 creates such a great epicness and atmosphere, like the whole world ruins before your eyes. This song is a true masterpiece, love it so much.
Also that moment, which starts from 9:42, when there is an acoustic guitar and then insensibly comes the drums, it's really catchy and haunting.