Alsvartr (The Oath) off Emperor's Anthems to the Welkin at Dusk is definatley the best. The whole thing is just so dark, and just keeps building up.Then those vicorious horns come in come in before finally peaking and feeding into Ye Entrancemperium. I don't know about a closer, but Eclosure in Flame off of Through Silver in Blood is amazing, its like a catharsis as everything is left after the entire album is being spilled out. Its like your in a race really pushing yourself at the end, you know your gonna crash but you just let every last bit out.