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Diablo 4 Season 9 brings a fresh wave of challenges and opportunities for Necromancer players looking to dominate the battlefield with devastating damage. Among the many viable Necro builds, the Shadow Blight Necromancer stands out as a top-tier choice for those wanting to break damage ceilings — even reaching the coveted 1 billion damage mark with the right setup. In this guide, we’ll break down everything you need to know to build, optimize, Diablo 4 Gold  and play this powerful build to its fullest potential.Why Choose the Shadow Blight Necromancer in Season 9?Necromancers have always excelled at controlling the battlefield through minions and powerful curses. Season 9’s Shadow Blight Necromancer synergizes dark shadow magic and blight effects to deliver explosive single-target and area damage. This build uses the latest skill reworks and gear buffs, maximizing damage output through shadow spells, blight stacks, and bone enhancements.The highlight? When properly geared and optimized, this build can easily surpass 1 billion damage per hit on bosses and elite monsters, allowing for rapid clearing of the toughest content in Diablo 4.Core Skills & AbilitiesTo create a Shadow Blight Necromancer capable of such immense damage, focus on the following skills:1. Shadow TendrilsYour main spammable skill. It deals shadow damage and applies a stacking Blight debuff on enemies, increasing the damage they take from your abilities.Maximize this skill early to rapidly build blight stacks.2. Blight NovaAn explosive burst that consumes blight stacks to deal massive AoE damage.This is your key damage ability and can easily hit for hundreds of millions once fully charged with blight.3. Bone SpearAdds extra piercing damage and synergy with your shadow spells.Great for single-target damage and bosses.4. Blood CurseAmplifies all damage enemies take and increases your survivability.Vital for increasing your overall damage output.5. Corpse ExplosionUse corpses left on the battlefield to create huge damage bursts. Works well when combined with your blight stacks and shadow spells.Talent Tree PrioritiesThe talent tree for this build should focus on maximizing:Blight duration and stacks — The more blight stacks, the more damage your spells deal.Shadow damage bonus — Invest heavily in passives that increase shadow spell damage.Cooldown reduction — For quicker usage of key abilities like Blight Nova and Corpse Explosion.Bone skill synergy — To enhance Bone Spear and other bone-based spells.Aim to unlock talents that increase your damage scaling off blight, extend the duration of curses, and reduce resource costs.Essential Gear and ItemizationReaching 1 billion damage requires perfect gear synergy. Here are the key gear types and stats you need to hunt for:1. Legendary ItemsShadow Blight Staff (or equivalent weapon) — Grants bonus shadow damage and increases blight stacks applied.Blight Nova Ring — Reduces cooldown and increases damage of Blight Nova.Bone Spear Amulet — Adds piercing damage and critical hit chance on bone skills.Corpse Explosion Gloves — Boost corpse explosion radius and damage.2. Set BonusesLook for Necromancer sets that increase blight effect duration, shadow damage, or damage against cursed targets.Prioritize sets that also offer cooldown reduction and resource regeneration.3. EnchantmentsFocus on Shadow Damage %, Cooldown Reduction, and Critical Hit Damage on your gear.Enchant gear to enhance your key abilities, especially Blight Nova and Shadow Tendrils.Stat PrioritiesTo maximize your damage output, aim for the following stats:+ Shadow Damage (Primary)+ Blight Effectiveness / Duration+ Critical Hit Chance & Critical Hit Damage+ Cooldown Reduction+ Increased Damage Against Cursed or Blighted Enemies+ Resource Generation or Cost Reduction (to maintain constant Shadow Tendrils spam)Gameplay Strategy for Maximum Damage1. Stack Blight QuicklyBegin by spamming Shadow Tendrils to stack Blight rapidly on enemies. Aim to build 20+ stacks for maximum damage amplification.2. Use Blood Curse EarlyApply Blood Curse to debuff enemies, increasing the damage they take from your spells.3. Unleash Blight NovaOnce your enemies have max blight stacks, unleash Blight Nova for massive AoE damage. On bosses, this can easily hit hundreds of millions per cast.4. Supplement with Bone SpearWhile managing your blight stacks, use Bone Spear to deal sustained single-target damage with piercing and shadow synergy.5. Exploit Corpse ExplosionsAfter killing enemies, use Corpse Explosion to clear adds and maintain control. This also contributes to your overall damage output.6. Maintain CooldownsThanks to your cooldown reduction gear and talents, cycle through your abilities efficiently to keep pressure high. Tips for Survivability and EfficiencyUse Bone Armor or defensive curses to mitigate damage while focusing on offense.Position yourself to maximize Blight Nova hits on clustered enemies.Keep moving to avoid boss mechanics while maintaining your blight stacks.Use minions or golem summons to distract enemies during cooldowns.SummaryThe Shadow Blight Necromancer build in Diablo 4 Season 9 is one of the most potent ways to smash through endgame content, with damage numbers easily reaching the 1 billion mark with the right setup. By stacking blight, maximizing shadow and bone damage, and buy Diablo 4 Items using powerful cooldown abilities like Blight Nova and Corpse Explosion, this build offers both insane burst damage and solid sustain.If you want to dominate the battlefield this season and shatter damage records, this build is your go-to. Gear smart, invest in the right talents, and master the flow of blight stacking and explosive shadow spells to become a true harbinger of death.