Healing from skills is increased by 100%.

Trag'Oul's Avatar Set (Set Bonus for 6 items): Blood Nova deals 3800% increased damage.

Bryner's Journey (Legendary Boots): Bone Spikes have a 20-30% chance to cast a Bone Nova at the target location.

Iron Rose (Legendary Phylactery): channeling Siphon Blood casts Blood Nova on every tick of damage.

Nayr's Black Death (Legendary Two-Handed Scythe): each different Poison skill increases the damage of all Poison skills by 75-100% for 15 seconds.

Bloodtide Blade (Legendary Two-Handed Scythe): deals 300-400% increased damage for every enemy within 25 yards of the Necromancer.

Scythe of the Cycle (Legendary Scythe): deals 350–400% additional damage while Bone Armor is active but each cast reduces the remaining duration of Bone Armor by 4 seconds.

Visually, nova becomes a splash of blood.

Blood Nova: Damage type changes to Physical, damage increases to 450%, but each cast costs 10% of maximum Life.

Visually, bone spines radiate outward instead of a nova.

Bone Nova: Damage type changes to Physical, damage increases to 475%, but radius reduces to 12 yards.

Blight: also leaves a lingering patch of blight on the ground, slowing enemies by 60% and causing them to deal 15% less damage, for 1 second.

Tendril Nova: Damage type changes to Physical, and also heals the Necromancer for 1% of maximum Life per target hit, but damage reduces to 225%.

Unstable Compound: Each cast increases the radius of subsequent Novas by 5 yards for a short time, stacking up to 2 times, but fading if the spell is not cast within that time frame.

Diablo II: Resurrected Review - Pile Of Old Bones

Diablo 3 wiki necromancer sets