Necromancers are practitioners of the dark art, with major powers focused on raising the the ancestors or dead to be used for various purposes.
The ancestors could be raised as apparitions or bodily for maybe divination or as a weapon in battle and directions in casting spells and rituals.
Necromancer love spells are consider to be the most effective and and fast spells if done well and organised.
This is because the necromancer talks direct with the power of ancestors. So just Imagine how fast and effective it will be.