How about the more literal aspects of Heart? We’ve seen Dirk ripping out souls, but that’s likely more related to his class as a prince than just the aspect as well. Of course we know more about it than Blood and Doom, but it’s still a little bit lacking.

With Heart is the Souls, it wasn’t the ripping of the Soul, rather the fact he could directly interact with Aranea’s Soul at all. Similarly, being ‘awake’ at the ‘same time’ both on Earth and Derse, the multiplicity of iterations of Dirk, that’s a bit more obtuse but still sort of plays into the Literal Heart territory I feel.