In other fantasy settings familiars are always possible, so yeah there should be some. However I would like there to be some kind of necromancy school or spell list, put absorb health spells in that and the summoning of undead etc...because it was annoying knowing it was being used by NPCs (or well at least that something CALLED necromancy was) and I couldn't use it
In Morrowind I made a ring with constant effect summon fire elemental
However it did not work to well as the stupid fire elemental was trailing you and then you attacked an enemy the fire elemental started casting fireballs towards the enemy and you was in the line of fire. However this is true with any followers with ranged attacks in Morrowind.
The problem that summons is to far behind was also a problem in Oblivion, found that it was often better to just cast summon again.
In SI you could get a animate dead spells from the ghosts on the hill of suicide.
it could be used in spells had I made one with three minute duration, however the reanimated only walked so they was unable to follow you.
Yes I could use it as a ranged area effect spell, kill one enemy in a group, cast spell to cause confusion but frenzy did much of the same without having to kill somebody first.