@Quertus: see, the funny thing about the Book is that if you rule it as non-infinite and less than universe-sized, that generates the possibility of destroying it and recovering it from beyond its range of effect! And since it is explicitly at least planetary in effect and stated to effect the world it is on, this turns it from a single-use universal WMD to multi-use planetary+ WMD. (It is also a D&D style spellbook with 9 9th level spells in it, so...)

Same applies to the Monolith. You can rule it as conceptually non-infinite... it still remains a setting-hopping time-hopping piece of crap, equivalent to TARDIS from Doctor Who. (Not a comparison invented by me; I've seen it in multiple third party reviews.)