>Not sure if this is something y'all want to answer but I was
>just curious if in larger graveyards new undead will only be
>summoned in a certain room or is it just the graveyard in
>general.

Implementation-wise, it's by room, but in practice it tends to be the whole graveyard if there's a bunch of graveyard rooms together. There could be an exception to this but I can't think of one.

>Do they also only craft at certain ranks? Just curious if I am
>wasting my time trying to find every graveyard I cant.

As soon as you can cast greater undead you're good to go.