Khan's Path

then the problem is that even after collecting all the obelisks, the entire map doesn't reveal itself. Therefore, you have to dig around. The Grail is located somewhere under a tree, and as far as I understand, it's specifically under a tree. The hero can't stand on that tree, and digging half a dozen holes around it doesn't help (it's east and southeast). So, theoretically, only a hero who has taken the useless skill of "Ashes' Patronage" can dig up the Grail. Or is there a missed moment? There's a shaman nearby, and I had a dialogue with her. But what's the point? It seems that without "Ashes' Patronage," you can't dig up the Grail. Or has someone already honestly dug it up? Then what's my mistake?