BLACK PANTHER/MARVEL/ASTRONOMY: Intergalactic Empire of Wakanda

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My big question for the night, and I blame the news about the real-universe exoplanets found orbiting 40 Eridani A and Pi Mensae today for asking it anew: which five galaxies does Ta-Nehisi Coates have in mind as being home to the Intergalactic Empire of Wakanda?

Since they've gotten into a fight once with the Shi'ar Imperium, I suspect that which galaxy (singular?) the Shi'ar call home might be the key to the answer...