Cosmic Keystone

7 living and non-living things are now the keystones that holds all of existence together. These keystones are a rock, tree, lake, person, elephant, planet and star. And the destruction/murder of each keystone will cause an apocalyptic event that can be felt across all of existence and gets worse with each keystone being destroyed until finally the last keystone is destroyed then all of existence is completely erased (no specific order).

How would the entire world/existence react to this when they find out?

i believe the cosmic keystone ability needs tweaks and improvements, it is true that the user is the nexus of something but there are times when authority has been stolen like in bleach that yawtch stole the Soul King's Nexus, or in Mirai Nikki where Dues Ex Machina has lost the nexus, no other examples come to me but in short, being a Nexus can be passed or stolen, what do you think?

He's an original character I made I got some suggestions for what his powers should be now I want to know what y’all think his name should be by the way his powers are listed in the tags and in the comments.

Is being a cosmic keystone similar to a ability nexus? And also are these types of ppl immortal?