It sounds like you want to go with a more non traditional Necromancer. Drmambo this is fantastic! Right now the Necromancer Meta usually revolves around the Necromancer only spawnpoints, but in the recent Thunderdome tournament we saw Keejchen play a very unexpected Necro that was very competitive.
Here's some links for reference to this very odd, yet very effective necromancer. Keej was brought down after 2 wins by the legendary Charmanya book, but still put up a very effective fight. This may give you some ideas for your buddy build.
Thunderdome II Keejchen matches
https://www.youtube.com/watch?v=vqH3Hz0v4Rshttps://www.youtube.com/watch?v=cmLJJpq5egEhttps://www.youtube.com/watch?v=4OsABOBrZPo-----------------------------------------------------------------------------------------------------------------
Using Bim Shalla or the Dawnbreaker is pretty effective with a buddy build. The armor +1 is great when dealing with swarms! Dawnbreaker usually doesn't get enough credit for it's ability to reroll damage which can save your buddy's life (lookin at your high dice fireballs
). A big question to bring up is that if you run those conjurations, is the Necromancer appropriate for mage to use? What will the Necromancer bring that you would wish to use those conjurations? The poison immune and ability to deal Direct damage during upkeep are a huge part of him and if you want to combo it with the temples it's gonna take some work (but I think it could work). I would love to suggest looking at Malacoda as a body guard buddy.
Grey Wraith is a cool choice. It combos with your poison mastery ability and helps you survive longer. Very similar idea with Mort except you are exchanging survivability for faster kills. The Dwarf Panzergarde is interesting. I'm not sure how I feel about it as the spellbook points are quite high (but they may allow you to get the damage through). I would love to see what your decisions are for creatures in this book!
The Mage wand idea with Animate Dead is fun trick for the dark mages. If you run a creature like malacoda it can be super effective. Not to mention you turn their swarms into your swarms with it
I imagine with a buddy build you will want a few buffs for them. Depending on what you choose, it would dictate if you need/how many enchanter's Wardstones you require.
Anyway I would love to see a book! Go in assuming it's just version 1 of many to be a competitive book. Hope this helps!