>>544067635
We kinda know how it works thanks to Leviathan. Vergilius focuses his mind on memories of the orphanage to conjure mang, essentially using strong emotions tied to his memories, trauma and feeling of loss to gain that power.

We don't know if strong positive emotions works for that though. For all we know that's how you activate Shin, while Mang requires negative ones? Pure conjecture on my part anyway, maybe there's not even a distinction between positive or strong negative ones.