Sam or Dean seek vengeance or destroy the world if the other one is killed

[nghthwk8]

I'm looking for stories where it is either an outsider or the impersonal 3rd person narrative that comments on the destruction or vengeance Sam or Dean will wrought if the other is killed. I guess implied in that is also what they will do to get the other back.

I'm not looking for Sam or Dean saying or thinking this. And I know about the Suite!verse which I've read many times and love but that isn't what I'm looking for.

It doesn't matter if its Wincest or just the dysfunctionally close relationship they have in canon.

Thanks.