I was going to make the deities in FFSkyrim (Ramuh/Ifirt/Shiva/Yunalesca) all in these temples and Yuna had to go
pray to them to get the summons... But I don't know how to script such
things so I didn't do this.

* When  I do learn how to do it I'll do an add dragon soul script and an if Temple Guard is dead then the
player and Yuna can learn the summon spell. 
    The player will have to learn it by praying at the shrine  (I think it's easy to add
those kinds of events through activators...

*The Necromancers in the temples are trying to resurrect the old gods but they've only
succeeded in twisting their powers and causing them to manifest in horrific forms.
 They're much more like enemy creatures and Deadra, 

  I'll add a book of hymns about the mages trying to obtain more power to gain control over skyrim  and how they managed to bring about the powers present in the temples. This will included various things about ingredients in Skyrim and their uses in alchemy, the properties of soul gems and how to extract souls, how to preform rituals (I'll be using some witchcraft references but changing them to fit Skyrim), How to make sacrifices, How to determine the cause of death.
   Another book  I'll add will also detail where other mages are (where mage enclaves are).
There will be others on Vampires and indict a particular court Wizard that is holding a sinister secret. (I'll try to mark this book as owned so if you steal it and that mage sees you she will attack you on sight.)


   --------> You'll be going through a strange door or portal where I'll make something akin to a cloister of trials from  final fantasy X- <------- 
     ^  The temple Guardian (deadman) will be guarding these  or I'll put him inside to be defeated^
I'll put the artifacts in a chest or something to be gained or just put them in the temple guardian's inventory

So my thoughts for Shiva's cloister of trials would include an Icy cavern however it would all be contained in the temple world space.  At the end you'll end up in a ring with the particular summon... Defeat him or her and you'll get the ability to summon them.

I also thought of creating a portal at the end that will just transport you somewhere in the world (probably an inn).

Don't worry the file size will not change!

I'll release any extra summons separately then merge those as part2