The Electro-Mecha Longsword is one of the strongest unique two-handed swords in Crimson Desert, and it comes with a built-in Lightning Affinity that lets every hit electrocute and potentially stun enemies. It sits at 27 Attack Damage, can't be upgraded or fitted with Abyss Gears, but remains a solid pickup — especially if you like watching robots twitch. The catch is that you have to earn it by killing the Machina Knight, a two-phase boss that will punish you if you show up too early.
Quick answer: Defeat the Machina Knight at Marni's Outpost in northern Deleysia (just north of Gorthak on the map) to receive the Electro-Mecha Longsword. No prerequisite quests are required, but the fight is best attempted during the mid-to-late game.
Electro-Mecha Longsword location in Crimson Desert
Marni's Outpost sits in the far eastern reaches of the Deleysia region, north of the area labeled "Gorthak" on your world map. The outpost itself is populated by hostile robots, so expect resistance before you even reach the boss arena. When you interact with the Machina Knight, the game automatically assigns the "Blade of Discipline" Deleysia Faction Quest — there's nothing you need to pick up or trigger beforehand.
Technically, you can travel here the moment the open world opens up. In practice, that's a bad idea. The Machina Knight hits hard across both phases, and the damage windows are tight enough that being underleveled turns the fight from challenging to miserable. Aim for mid-game at the earliest, once you've upgraded your gear and have a comfortable health pool.
| Detail | Info |
|---|---|
| Weapon type | Two-Handed Sword |
| Affinity | Lightning (electrocute + stun on hit) |
| Attack Damage | 27 |
| Upgradeable | No |
| Abyss Gear compatible | No |
| Drop source | Machina Knight (Marni's Outpost, northern Deleysia) |
| Prerequisites | None — triggers "Blade of Discipline" quest on interaction |
Machina Knight boss fight — Phase 1 (Marni Longsword)
The first half of the encounter is relatively straightforward once you understand the rhythm. The Machina Knight opens with a longsword and relies heavily on a repeating three-hit combo. Each swing in that chain can be parried with a well-timed L1, whether you're blocking with a shield or your weapon. Successfully parrying breaks the combo and opens a brief window for counterattacks.
Those windows are small, so favor fast strikes over slow, heavy swings. Turning Slash (R1 + R2) is particularly effective here because it both deals solid damage and interrupts the Machina Knight's attack animations. A reliable loop for this phase is to land a Turning Slash, parry the incoming counter, then immediately Turning Slash again. Repeat until the boss loses roughly half its health.
Machina Knight boss fight — Phase 2 (Marni Spear)
Once the Machina Knight drops to around 50 percent health, it ditches the longsword and picks up a spear. Everything changes. The boss becomes significantly faster, more aggressive, and gains access to invulnerability windows that make standing still a death sentence.
Parrying is technically still possible against spear attacks, but each block drains a massive chunk of stamina. Running out of stamina mid-combo leaves you completely exposed to follow-up hits. The safer approach is to dodge-roll through attacks and reposition rather than trying to stand your ground.
During invulnerable phases, the Machina Knight launches seeking cubes that track your position and deal damage on contact. You cannot block these reliably — dodge-roll through them and keep moving until the invulnerability ends. Once the boss returns to its normal attack patterns, close the gap and use Turning Slash (R1 + R2) to chip away at its stun meter.
Building the stun meter is the key to finishing Phase 2 efficiently. Once the meter fills, the Machina Knight staggers, giving you a long window to unload your heaviest damage. This is where the fight ends for most players — a full stun window plus aggressive follow-up attacks should be enough to close out the remaining health bar.
Confirming the drop
The Electro-Mecha Longsword is awarded automatically once the Machina Knight dies. You'll see it added to your inventory, and the "Blade of Discipline" quest will update to reflect the completion. From there, you can equip it immediately — no crafting, no additional turn-ins. Every melee hit you land with the sword carries the Lightning Affinity effect, making it especially useful against enemies that are vulnerable to stun buildup.
While the sword's inability to accept upgrades or Abyss Gears limits its ceiling in the very late game, the raw 27 Attack Damage combined with consistent electrocution procs makes it a reliable main weapon through a large portion of Crimson Desert's content. If you're hunting for a lightning-element option, this is one of the best you'll find.