Spoken about this with @Govind.

A "Universe" tag that can be added to books to show that they are part of a given Universe rather than a 1000 book unordered list that groups them all.

Having a Warhammer 40K list is nice in principle, but it doesn't half mess up any meta data pulls I do into Booklore or Calibre, If the actual series that book is a part of isn't the featured or 'top' series it isn't seen (Of course that is an issue with metadata files only supporting 1 series, something I am thinking about trying to fix with an updated format).

In reality Warhammer series can be broken down into groups and then reading lists.

For example the Horus Heresy is a major canonical event. Which has multiple internal series such as The Horus Heresy: Primarchs and The Horus Heresy: Characters and even the Horus Heresy it self can be broken into multiple lists (https://www.kylebb.com/HH/HHSeriesOrder.jpeg) (It's pretty ridiculous, how ever I don't think this request should go that far really) it is then followed on by the major event The Scourge. So in the case of Warhammer, these major events would be the Subgroups that @Govind has spoken about. + another grouping at the end to collect misc books that are not really part of the timeline or a series, but are part of the Universe e.g supplementary material so that series lists arn't taken up with multiple extras.

This extends to something as simple as Dune in my opinion, where there is a Prequel, main, sequel and branching books.

Star Wars simply goes without saying... there is alot.

List could go on and on.

So in Summary:

• A Universe Tag to show a book belong to a Universe such as Warhammer 40K to avoid messy lists.

• A Universe Page, which is editable by Librarians/Admins only (to stop people from changing it to their preferred order). Could contain lists which are tagged as Universe. So that we can create Canonical lists of reading lists. User's own reading lists could appear at the bottom.

• Universe Tag would appear as a Golden Tag between Book cover and first series affiliation.

• Universe page would also have a horizontal scroll of the Authors of the series (Order by number of books they wrote? or by most recently published?)

• Universe tag would also be the first tag attached to a book so that metadata pulls can also have some kind of link between books. At the minute it is very hit and miss, especially when filling in the gaps with other meta data providers.