For a list of all spells which are of the school of Necromancy, see: Category:Necromancy spells.
Gameplay Notes Edit
Necromancy is never able to be chosen as an opposition school by any wizard meaning these spells are always available to all wizards. This means there is little need to discuss the pros and cons of the entire school in case you could choose to have it as an opposition school. Necromancy's opposition school is Divination.
This school is geared heavily towards negative damage attacks and ability reduction. Since it cannot be taken as an opposition school, every mage and caster has access to all necromancy spells.
There are also some summoning spells, such as Create Undead, which are an alternative to those who took the Abjuration, Evocation or Transmutation school as their speciality, which restricts the summoning spells from the Conjuration spell school. The undead summoned usually have a great amount of undead resistances over the summoned monsters.
There are some very useful save-free spells, like Ray of Enfeeblement, Vampiric Touch. However, these spells are mostly death spells or negative spells; that is, they are totally useless when you are fighting against undead.