Concepts - Other - Rent
A tear in the spiritual fabric of the world which allows Essence to escape into Oblivion. Demiplane spirit worlds seem to form around vents. Vampires seem obsessed with sealing the rents themselves by ritually sacrificing powerful supernatural persons.
At least that’s how Rents used to seem to work. After the apocalypse black winds of alien energy seem to be pouring into the world from rents.