Combo of the two DLCs

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On the final battle between Miraak and myself, I thought "bugger this" and teleported myself and Miraak into a more familiar setting. (I tend to use the Soul Cairn as a realm of my own of sorts for me Vamp guy)
With my own pet Dragon that is Durnehviir (Miraak isnt the only Dragonborn with his own pet) as well as Valerica who-for-some-stupid-reason-has-not-left-the-soul-cairn-even-after0I-told-her-Harkon-is-dead was haning about.

Also when I transported to the Soul Cairn, the void Sky changed into what is similar in Apochra (cant remember the proper spelling) The sky went all greeny...

I take it as Miraak's presence in the Soul Cairn as a twisted warpness of two realms of Oblivion coliding.