Deathshroud

Deathshroud draws upon the Negative Material Plane to surround the caster in a dark and shadowy aura of life-draining energy. While the spellcaster suffers no ill-effects from this baneful radiance, it may have dire consequences for anyone who comes into contact with the aura.
The deathshroud can be used actively in offense and passively in defense. In combat, the wizard may activate the deadly power of the spell by touching a victim (requiring a successful attack roll). Any creature touched must immediately save vs. death magic with a -4 penalty. If the roll is successful, the victim is unharmed. If the save is failed, a black haze forms around the victim, draining 20% of his or her current hit points each round until the unfortunate individual dies at the end of the fifth round. The deathshroud also serves as a passive ward or protection for the caster. Anyone who touches the wizard or attempts to strike him or her with any hand-held object or melee weapon must make a saving throw vs. death magic (with no penalties) or be stricken by the deathshroud in a similar manner.
The following spells remove the deathshroud from an afflicted individual: Cure Critical Wounds, Heal, Limited Wish, Wish, or a successful dispel magic. Lesser curing spells and healing potions delay death only by one round. Multiple applications of these spells or potions may prolong a victim's life until the duration of the spell expires. The spell may also be ended prematurely by killing or successfully employing dispel magic on the caster (this immediately releases all creatures afflicted by the spell).
The deathshroud remains in effect until the wizard has successfully attacked or been attacked by a number of creatures equal to his or her current level (or the spell's maximum duration of two rounds per level has elapsed). Undead are not affected by this spell. In fact, if an undead creature is attacked by a deathshroud, it immediately gains 1 HD, and the wizard must save vs. death magic or suffer the effects of the death shroud him- or herself.
This dreadful spell is known only to a select cadre of necromancers who purportedly learned it from a mysterious, bronze-bound book of extraplanar origin.
The material components are consumed in the casting.

[Complete Book of Necromancers]

School: Necromancy
Level: 8
Rarity: Very Rare; Known to be in the book Oerthmagick by Nazralte G.C.

Range: Touch
Components: V, S, M
Duration: Special (2 rounds/level maximum)
Casting Time: 8
Area of Effect: 1 creature/ level
Saving Throw: Negates

Material Components:
crushed black opal and diamond (worth 5,000 gp each), dust from a corporeal undead with strong ties to the Negative Material Plane (such as a vampire or wight), and a hunk of smoky quartz