Warhammer 40k Necrons Lore & Army Guide: Commanding The Undying Legions

If you’ve ever wanted to roll dice as a galaxy-crushing robot pharaoh, the Necrons are basically your dream faction. In Warhammer 40k, they’re ancient, hate almost everything that’s alive, and refuse to stay dead. This Necrons Lore & Army Guide is built to give you both sides of the coin: the story that makes them cool, and the rules-focused breakdown that makes them playable and competitive on the tabletop.

We’ll start with the big-picture lore, then drill into their army rules, playstyle, key units, and practical strategies. By the end, you’ll know what makes Necrons tick, how they actually win games in Warhammer 40k, and what to look out for when building and playing your army.

What Are The Necrons In Warhammer 40k? (Lore Overview)

The Necrons are one of the oldest and most iconic factions in Warhammer 40k. They began as a fragile, short-lived species called the Necrontyr, cursed to live under a lethal star that bombarded them with radiation. Their lives were short, bitter, and filled with jealousy toward longer-lived races like the Old Ones.

Desperate to escape their fate, the Necrontyr made a deal with godlike star predators known as the C’tan. In exchange for their mortal shells, the C’tan promised immortality. That “gift” came in the form of biotransference: the Necrontyr’s souls were ripped out, their flesh stripped away, and their consciousness forcibly installed into living metal bodies. They became the Necrons—an undying, emotionless machine race bound to their Silent King and the C’tan.

Eventually, the Silent King realized the cost of what they’d done: the Necrons had traded their species’ soul for a twisted version of immortality. In a galaxy-shaking revolt, the Necrons shattered the C’tan into shards, entombed themselves in stasis tombs, and went to sleep for millions of years—to awaken later in the current era of Warhammer 40k, when the galaxy is already in chaos.

Now, as tomb worlds awaken, Necron dynasties rise across the galaxy, each ruled by a Necron Overlord or Necron Lord with their own agendas. Some want to reclaim their lost empire. Some want orderly domination. Others just want to annihilate everything that still dares to be alive. On the tabletop, that lore translates into slow, relentless, high-tech undead robots who won’t stop marching no matter how many times your opponent thinks they killed them.

Necrons Lore & Army Guide: Core Faction Identity And Playstyle

As a Warhammer 40k army, Necrons are all about durability, board control, and relentless pressure. They’re not the fastest faction and they’re not the most elite in terms of raw stats, but they excel at two things: not dying, and holding objectives while not dying.

Core identity points you’ll feel on the tabletop:

• Undying infantry walls – Basic Necron Warriors and Immortals are surprisingly tanky and can come back from the dead.
• Accurate, consistent shooting – Necrons favor reliable mid-range firepower over swingy high-risk plays.
• Elite, character-driven synergies – Crypteks, Lords, Overlords, and special characters boost nearby units and unlock powerful combos.
• High-tech toys – Vehicles and monsters like Doomsday Arks, Monoliths, and Silent King-style centerpiece models give Necrons strong long-range and area control options.

If you prefer methodical, controlling gameplay where you steadily grind your opponent down while refusing to leave the table, Necrons fit perfectly. If you want hyper-aggressive melee alpha strikes or super-elite small model counts with tons of tricks, Necrons can dabble in that, but it’s not their default lane.

Key Necron Lore Themes That Shape Their Army Rules

This Necrons Lore & Army Guide isn’t just about fluff—those story beats explain why their rules work the way they do:

• “We Never Truly Die” – The lore of self-repairing living metal bodies shows up as rules that let your units stand back up or ignore casualties over time.
• Ancient Empires, Rigid Command Structures – Dynasties, noble houses, and overlords are reflected in aura abilities, command buffs, and army-wide rules tied to specific leaders.
• Cold, Logical Warfare – Necron weapons tend to be precise and reliable, with solid profiles rather than tons of random swing.
• Star Gods In Chains – C’tan shards appear as powerful, almost mini-boss models that bring reality-warping abilities to the table.

Understanding this lore will help you see why certain units perform certain roles—and why your army works best when you lean into those themes instead of trying to turn Necrons into something they’re not.

Core Rules And Mechanics For Necrons In Warhammer 40k

Specific wording and numbers vary between editions and codex updates, but the Necron faction consistently revolves around several core mechanics. When you’re building or buying your first Necron force, these are the systems you need to know.

Reanimation And Durability

The reanimation-style mechanic (under names like “Reanimation Protocols”) is the signature Necron rule. While exact implementation changes over time, the concept is consistent:

• When your Necron models die, you often get some kind of chance to return them to the battlefield, either immediately or at the end of a phase/turn.
• Units with more models (Warriors, Immortals) tend to benefit the most, as they give you more dice/rolls and more opportunities to re-stand models.
• Support characters like Cryptothralls, Crypteks, or Technomancers commonly enhance these rolls or directly bring back models.

On the tabletop, this means your opponent must overcommit to wiping Necron units or risk seeing part of that squad stand back up and keep holding objectives. As a Necron player, your job is to position carefully, soak damage, and then punish your opponent for failing to fully finish you off.

Dynasties And Subfaction Traits

Necrons are split into dynasties, each representing a different ancient royal house, with their own combat style. In game terms, dynasties work like subfactions: you pick one during army construction, and your units gain specific bonuses.

Examples of dynastic themes (exact names and buffs vary over time):

• Aggressive dynasties – Bonuses to movement, charges, or close combat, rewarding you for pushing forward.
• Shooting dynasties – Improved accuracy, AP, or range, turning your gunlines into laser-precise death zones.
• Durability dynasties – Extra defensive rules or improved reanimation, making your army even harder to shift.

When starting Necrons, choose a dynasty that fits your preferred playstyle rather than chasing pure meta. If you like advancing and punching, pick mobility/melee-focused traits. If you love gunlines and methodical shooting, lean into the dynasties that buff ranged combat.

Command Protocols, Auras, And Character Support

Necrons are heavily reliant on characters and auras. Overlords, Lords, Crypteks, and special named characters provide buffs to nearby units, such as:

• Improved hit rolls or wound rolls.
• Extra reanimation rolls or healing.
• Movement bonuses or redeploy tricks.
• Improved objective control.

Many Necron game plans revolve around a dense core of infantry backed by one or two support characters, forming a “phalanx” that marches up the board. If you split units away from their support too early, you lose a lot of your army’s power.

Gauss, Tesla, And Other Necron Weapons

Necron guns are defined by two iconic weapon families:

• Gauss weapons – Versatile, armor-shredding guns with solid strength and armor penetration (AP). Think of them as your primary tools for mulching Space Marines and other heavy infantry.
• Tesla weapons – Weapons that can generate extra hits on high to-hit rolls, making them fantastic into hordes or lightly-armored targets.

On top of those, Necrons bring exotic toys like:

• Death rays and doomsday cannons – High-strength, high-damage shots for punching tanks and monsters.
• Entropic and particle weapons – Flexible tools that can deal with a range of threats, often on vehicles or heavy support units.

Understanding your weapon profiles and building your list so you have tools for infantry, armor, and elite threats is crucial for competitive Necron play.

Building A Necron Army: Key Units And Roles

This Necrons Lore & Army Guide wouldn’t be complete without a breakdown of core unit types. Below are the most important categories you should think about when building your list.

Battleline / Troops: Warriors And Immortals

These are the backbone of your force, controlling objectives and forming the core of your reanimation engine.

• Necron Warriors – Large units, cheaper per model, with good durability and decent shooting. They’re your primary board-control units, perfect for holding objectives, screening, and soaking fire.
• Immortals – More elite troops with better armor and firepower. Fewer models per unit, but more reliable shooting. Great for holding mid-board or anchoring a defensive position.

Most lists start with at least one or two blocks of Warriors or Immortals. If you’re new, a strong core of Warriors backed by reanimation buffs is a safe starting point.

Characters: Overlords, Lords, Crypteks, And Named Heroes

Necron characters bring your army’s synergy and flavor.

• Necron Overlords / Lords – Commanders with strong melee weapons and key buffs to nearby units. Often provide rerolls or combat bonuses.
• Crypteks (Technomancer, Chronomancer, etc.) – Tech-priests who supercharge your army. One might enhance reanimation, another might buff invulnerable saves or movement.
• Named characters – Dynasty-specific or iconic heroes who bring unique relics, wargear, and powerful aura abilities, often defining an entire army’s playstyle.

At low to mid points values, you’ll usually want one main commander and one support Cryptek backing your infantry.

Elites: Lychguard, Praetorians, And More

Elite units give Necrons some punch and flexible tools.

• Lychguard – Tanky melee bodyguards that can escort your characters. Great for creating a deathstar-style brick that marches up the middle of the board.
• Triarch Praetorians – Mobile elite infantry with jump packs or similar mobility tech. They can trade durability for mobility and melee utility.
• Flayed Ones – Close-combat infantry themed around Necrons who retain a twisted obsession with flesh. Typically used as melee threats and objective grabbers, often via deep strike-style deployment.

Elites are your scalpel units—used to hit specific threats, counter-charge enemy assault units, or secure key objectives.

Fast Attack: Scarabs, Wraiths, And Mobile Threats

• Canoptek Scarabs – Cheap swarms that are excellent for screening, tying up enemy units, and grabbing far-flung objectives. Low individual power, high utility.
• Canoptek Wraiths – Fast, hard-to-kill assault units with strong mobility tricks. Often used to pressure backlines or contest objectives early.

Fast attack options are critical in a Necron army because your core infantry are usually slower. A few fast units let you dictate engagements and contest objectives your opponent thought were safe.

Heavy Support And Vehicles: Arks, Doomsday Guns, And Monoliths

This is where Necrons bring out the big guns and living tanks.

• Ghost Arks – Transport and support vehicles that can carry Warriors and often help with reanimation or durability. Fantastic for pushing the mid-board.
• Doomsday Arks / Heavy Weapons Platforms – Long-range fire support, ideal for cracking open enemy tanks or punishing elite infantry.
• Monoliths – Iconic floating pyramids. Big, tough, and bristling with guns, often with teleportation-style abilities to redeploy Necron units.

Heavy support gives your army reach—forcing your opponent to respect your firepower even if most of your force is marching up the table at a steady pace.

C’tan Shards: Mini-Gods On The Table

C’tan shards represent fragments of the star gods the Necrons once served and later destroyed. In-game, they’re elite monsters with powerful, often unique abilities that break normal rules: reality-warping powers, mortal wounds, and special attacks that ignore conventional defenses.

They’re usually:

• High-risk, high-reward models.
• Strong at cracking tough enemies or warping battlefield positioning.
• Best when built around, not just casually thrown into a random list.

If you love the god-fragment aesthetic and want a center-piece threat that feels different from standard infantry/vehicle gameplay, a C’tan shard is worth exploring.

Necrons Lore & Army Guide: Strengths, Weaknesses, And Play Patterns

Necron Strengths

• High durability – Between solid saves, multi-wound models, and reanimation mechanics, Necrons are extremely hard to wipe off the table.
• Board control – Big blocks of Warriors and durable units let you sit on objectives and force your opponent to come to you.
• Consistent shooting – Necron guns tend to be steady and reliable, with fewer “all or nothing” rolls.
• Simple to start, deep to master – The basic idea (walk onto objectives, don’t die) is straightforward, but the layering of auras, dynasties, and unit synergies gives long-term depth.

Necron Weaknesses

• Limited extreme mobility – Outside of specific units (Wraiths, Praetorians, teleport tricks, or transports), Necrons don’t zip around the board like some other factions.
• Reliance on support characters – Lose your Crypteks and Overlords too early, and your whole army gets noticeably weaker.
• Can be out-punched in melee – You have serviceable melee options, but dedicated melee factions can still beat you if you take them head-on without support.
• Vulnerable to focused alpha strikes – An opponent who can delete whole units in one phase can minimize your reanimation and tilt the attrition war in their favor.

Typical Necron Gameplan

1. Deployment – You set up a durable core around key objectives with characters in the middle to project buffs. Fast units deploy to threaten flanks.
2. Early Game – You advance steadily, claim midfield, and use long-range guns to soften enemy threats.
3. Mid Game – Your infantry phalanx locks down objectives; elites and fast attack hit contested areas, while reanimation keeps your core afloat.
4. Late Game – If you’ve preserved your characters and main blocks, your opponent should be running out of resources while your units refuse to stay dead, letting you outscore them on objectives.

Practical Tips And Strategies For Playing Necrons In Warhammer 40k

• Protect your characters – They are your buff engines. Keep them screened by infantry and avoid leaving them exposed to snipers or deep-striking assault threats.
• Commit fully to wiping enemy units – Don’t spread your firepower too thin. Erase key enemy squads to reduce their scoring potential and avoid counterpunches.
• Layer your buffs – Plan your movement so key units benefit from multiple overlapping auras (e.g., hit rerolls plus reanimation boosts).
• Use fast units proactively – Scarabs and Wraiths should be on the move, screening enemy deep strikes, tagging enemy shooting units in melee, and contesting objectives early.
• Exploit terrain and line-of-sight – Your goal is to force your opponent into bad trades. Hide your heavy hitters until you can strike first or at least trade evenly.
• Plan for mission scoring – Necrons naturally lean into objective-focused play. Build lists with enough bodies to hold multiple points and enough mobile elements to grab secondaries.

Common Mistakes Necron Players Make (And How To Avoid Them)

Even with this Necrons Lore & Army Guide, it’s easy to fall into a few traps when you’re new to the faction.

• Overextending your phalanx – Marching too far forward too fast can leave your characters exposed and split your forces. Always ensure your frontline is still in aura range.
• Ignoring fast attack options – Leaning only on slow infantry makes it easy for opponents to outmaneuver you. Include at least one or two mobile units.
• Underestimating objective play – Trying to table your opponent instead of focusing on objectives wastes Necrons’ natural strengths. You win on points, not just body count.
• Taking too many toys, not enough bodies – Filling your list with big monsters, vehicles, and C’tan but skimping on Warriors/Immortals often leads to not enough ObSec bodies to actually win missions.
• Misusing reanimation – Assuming units are “safe” because of reanimation can be a trap. If a unit is likely to get fully wiped and you can’t realistically revive it, position more cautiously.

Frequently Asked Questions About Necrons Lore & Army Guide In Warhammer 40k

Is The Necron Army Good For Beginners In Warhammer 40k?

Yes. Necrons are one of the better starter factions in Warhammer 40k. Their units are forgiving thanks to high durability and reanimation-style mechanics, and their core gameplan—move onto objectives, trade efficiently, and grind the opponent down—is easy to learn. There’s still plenty of depth in dynasty choices, character synergies, and list building, but you won’t lose a game instantly from one early mistake the way you might with a more fragile faction.

What Is The Best Way To Start A Necron Army?

The most efficient starting point is usually a combination of core infantry and at least one support character. A couple of units of Necron Warriors or Immortals, plus an Overlord or Cryptek, will give you a functional core. From there, add a unit of fast attack (Scarabs or Wraiths) and a piece of heavy support (like a Ghost Ark or Doomsday-style gun platform). This gives you a balanced force that reflects how Necrons actually play while you learn the faction.

Are C’tan Shards Worth Taking In A Necron Army?

C’tan shards can be very strong, but they’re not auto-includes. They work best in lists built around them, where you protect them with screening units and leverage their unique powers to crack problem targets. If you’re brand-new, you might want to learn the basics of Necron infantry, characters, and vehicles first, then experiment with a C’tan once you’re comfortable managing multiple overlapping rules and power timings.

Do Necrons Have A Competitive Place In Warhammer 40k?

Necrons almost always have at least one or two viable competitive builds in any given edition, largely thanks to their strong durability, reliable shooting, and objective-focused playstyle. Balance shifts over time with new codexes and rules updates, but Necrons’ fundamental toolkit is solid enough that they rarely feel completely out of contention. If you build with mission scoring and synergy in mind, you can absolutely take them to competitive events.

Should I Focus On Shooting Or Melee With Necrons?

Necrons lean naturally toward shooting-first, melee-second gameplay. Their shooting is more universally strong and easier to build around, while melee is better used as a supporting element—counter-charging, finishing weakened units, or contesting objectives. Hybrid lists that shoot well at mid-range and have a few melee threats (like Wraiths or Lychguard) tend to perform better than pure melee Necron builds.

Conclusion: Is Necrons Lore & Army Guide Worth Following For Your Next Warhammer 40k Faction?

If you’re looking for a faction that feels as cool in the lore as it plays on the table, the Necrons are an excellent choice. This Necrons Lore & Army Guide has walked through their origin as cursed star-worshipers turned immortal machines, and how that story becomes a slow, relentless, objective-focused army in Warhammer 40k. With durable infantry, powerful support characters, and high-tech wargear, Necrons reward players who like methodical play, strong board control, and the satisfaction of watching their opponent’s “dead” targets stand back up and keep fighting.

Whether you’re painting up your first block of Warriors or tuning a tournament-ready dynasty, mastering Necrons is about embracing what they do best: never rushing, never panicking, and never, ever staying dead.