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Weapons and Armor Proficiency: Same as evil Dread Necromancer.

Spellcasting: Same as Dread Necromancer, see revised spell list below.

Deathless Touch (Su): Positive energy flows through a dread necromancer’s body, concentrating in her hands. At will, but no more than once per round, she can make a melee touch attack against an undead foe that deals 1d8 points of damage, +1 per four class levels. This
touch heals living creatures, restoring 1 hit point per touch, +1 per four
class levels. A dread necromancer can use the spectral hand spell to deliver this attack from a distance.

Rebuke Deathless (Su):
A dread necromancer can turn undead creatures and rebuke deathless by channeling passive energy through her body. See the cleric class feature described on page 33 of the Player’s Handbook.

Deathless Body: Starting at 2nd level, a dread necromancer begins her journey into deathlessness. The first symptom is her body’s increased
resilience to physical harm. She gains DR 2/bludgeoning and magic. As the dread necromancer increases in level, this DR increases in effectiveness, to DR 4 at 7th level, DR 6 at 11th level, and DR 8 at 15th level.

Positive Energy Burst (Su): Beginning at 3rd level, a dread necromancer gains the ability to emit a burst of positive energy from her body, harming undead creatures within 5 feet of her. This burst deals 1d4 points of damage per class level. A successful Will save (DC 10 + 1/2 her
class level + Cha modifier) reduces damage by half. Living creatures within this burst are healed the same amount of hit points as the damage she deals to living creatures. A dread necromancer can use this ability once per day at 3rd level, and one additional time per day for every five levels she attains beyond 3rd (2/day at 8th level, 3/day at 13th level, and 4/day at 18th level).

Revised Dread Necromancer Spell List

1st Level: Bane, bestow wound, cause fear, chill touch, detect
magic, detect undead, doom, hide from undead, cure light wounds,
ray of enfeeblement, summon undead I*, undetectable alignment

* If you want to replace this with ectoplasmic armor or something, fine. These changes require adding Heroes of Horror to the list, but nothing else.