Question about Morde rework ult and Yuumi

Hiya, I like the rework for morde, but I'm just wondering if anyone knows what happens if a Yuumi is attached to a Morde and he uses his ult on an enemy champion. Will Yuumi join him in the death realm, or will she just float around untargetable on the map where Morde is walking but outside of the death realm, or will she be automatically dismounted? And will she be invisible during that time also since I believe the champions in the death realm become invisible if I understand it right? Thanks!
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