And last but not least

It then moves in to the Y'Anu theme over the moaning tympani and bass drum. This theme is first heard in the Reaper of Souls intro cinematic, which takes place in the Tomb of Rakkis where Tyrael attempts to hide the Black Soulstone.

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 Y'Anu was written as a meditative chant of the Horadrim whereby the acolyte could meditate on the mysteries of Anu, or The One.
And last but not least,

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Malthael's signature theme (which I mentioned above) buttons up the end.