The Moor : when the main riff comes in and there is a change in drumbeat a few times
The drappery falls : When it goes heavy after the amazing vocal part before
Patterns in the Ivy: that whole instrumental
When: "this day wept on my shoulders.."
Ghost of perdition: the mellow vocal theme in the middle
hmm im sure I could find that spine chilling goodness in almost every Opeth song