Source of Necromancy spells?

[Silverhand]

Do all Necromancy spells (regardless of spell list used) require access to the negative energy plane?

That is: if a PC was on a plane that did not touch the negative energy plane, could that PC cast Necromancy spells?

[Rysky]

Um, no. If a spell is Plane dependent it all specifically call it out.

Necromancy isn't just "negative energy spells" it's about magic involving life and death and everything inbetween (for the most part).

So yes, they can cast them anywhere that isn't specifically called out as blocking the Necromancy school