Once per short rest, you may cast a ritual necromancy spell in half the time it would normally take. Additionally, once per long rest, you may cast a necromancy spell as though you were adept at it.
You also gain the Intrusive and Oppressive casting styles.
The range of the triggering spell is doubled.
If the triggering spell is an attack spell, you make the attack roll with advantage. If it is a feat spell, its targets make their feat save with disadvantage.