There's a lot of speculation that the soul stone is...[spoiler]on Earth and is in some way connected to the heart-shaped herb in [i]Black Panther[/i]. It's worth noting that consumption of the herb allows one to commune with deceased relatives.[/spoiler]
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That's got to be it. T'Challa literally [spoiler]talked to his dead father in the ancestral plane.[/spoiler]
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[spoiler]As did Erik Stevens, a.k.a. Killmonger[/spoiler]
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Huh didn't think of that
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It would explain the huge battle in Wakanda in the [i]Infinity War[/i] trailer.