Part of me wonders if the black garden mountain is where the original black heart was supposed to be in the open space concept, before they restricted the usable map size. Or if it was meant for a much larger story in the garden we've not seen There is still so much of the black garden that is a mystery. I'd love to know more about the ruin tree, pujaris dream, etc. I used to think that the vex were growing the organic part of themselves/their original species in the ground in the garden and the flowers marked where each was grown. As if they were a species that once were nearly destroyed and saved some biological element of their species in the black garden, and certain members had their organic parts put in a machine body (vex, the gardeners in pujaris Dream) to tend and care for the biological remains of their species buried in the garden, in hopes that one day their original species could be restored. I suppose this could still be possible but nothing in grimoire about the vex added since vanilla supports this.