Ergo Sum

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"I don't have time to explain why I don't have time to explain."
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Ergo Sum
Ergo Sum.jpg
Production overview


The Traveler

Rarity class:


Weapon type:


Intrinsic frame:



Ammunition type:



SolarS.png Solar
VoidS.png Void
ArcS.png Arc

Service history

In service:

The Guardian


The Traveler
The Guardian


"Silent. Silent. Silent."
— Weapon Description

Ergo Sum is an Exotic Sword in Destiny 2 introduced in The Final Shape expansion and acquired from the "Destined Heroes" quest. This sword is unique among existing swords at is the first special ammo Exotic sword in the game, as well the first special ammo sword overall. After initially completing the Destined Heroes quest, Ergo Sum can be earned through The Pale Heart's Pathfinder objectives for up to two resets per week on each character a player has, upon completing the daily Overthrow activity and upon the completion of the Grandmaster difficulty of Excision.


Ergo Sum is one of three Exotics in which there is no defined or set roll for the weapon. In the case of Ergo Sum it can instead roll with a Solar, Void, or Arc damage type, alongside any sword frame, blade or guard. It's intrinsic perk is randomly rolled from a selection of 8 pre-existing exotic intrinsics.


Intrinsic Trait Intrinsic Frame Barrel Bowstring Blade Haft Sight Magazine Arrow Guard Perk 1 Perk 2 Stock Grip Origin Catalyst

Wolfpack Rounds: Powered heavy attacks cause nearby Sword-wielders to emit tracking missiles with every attack.[1] Vortex Frame: [Heavy Attack]: Launch a heavy spin attack.
Heavy attacks are stronger with full energy.
Hungry Blade: Increased sword ammo. Balanced Guard: Sword Guard has balanced overall defenses. Transcendent Duelist: This weapon collects less ammo.
Final blows with this weapon accelerate Light and Darkness mastery.
Deals increased damage while Transcendent; defeating targets lengthens Transcendence.
Gathering Light: Final blows with this weapon grant stacks of Gathering Light, improving guard stats and lunge range. Stowing this weapon consumes all stacks, granting melee, grenade, and class ability energy.[2] Caster Frame: [Heavy Attack]: Launch a heavy projectile attack.
Heavy attacks are stronger with full energy.
Enduring Blade: Greatly increased sword ammo at the cost of damage. Burst Guard: Sword Guard has high resistance, but low endurance.
Sacred Flame: Powered heavy attacks mark nearby targets, causing them to explode upon death. Striking marked targets with a Light attack detonates them.[3] Wave Sword Frame: Heavy attack deploys a shockwave uppercut and launches the user into the air.
An immediate follow up swing after the uppercut deploys a homing strike that aggressively seeks a target.
Honed Edge: Increased sword damage. Enduring Guard: Sword Guard has high endurance, but low resistance.
The Perfect Fifth: Every five hits attach a delayed Solar explosive, scorching your target.[4] Lightweight Frame: Fast Movement.
[Heavy Attack]: Dash Attack.
Jagged Edge: Increased damage at the cost of sword ammo. Heavy Guard: Sword Guard has high overall defenses, but lowers charge rate.
Arc Conductor: Powered heavy attacks charge the wielder, enabling them to resist Arc damage and chain lightning to nearby targets.[5] Aggressive Frame: Powerful, heavy swings.
[Heavy Attack]: Slam.
Tempered Edge: Increased sword damage and ammo. Swordmaster's Guard: Sword Guard has low overall defenses, but increases charge rate.
Stormbringer: Rapid final blows create a lightning storm at the target's location.[6]
Unplanned Reprieve: Powered heavy attacks emit projectiles that detonate with a delayed Void blast.[7]
Insectoid Robot Grenades: Defeated targets drop insectoid robots that chase and explode close to other targets. [8]


The Exotic Catalyst for Ergo Sum can be acquired from completing Excision on Grandmaster difficulty. It unlocks the following perk after 500 weapon kills:

Intrinsic Trait Intrinsic Frame Barrel Bowstring Blade Haft Sight Magazine Arrow Guard Perk 1 Perk 2 Stock Grip Origin Catalyst

Transcendent Steel: Dealing damage with a Transcendent grenade grants Ergo Sum ammo.


"And my vanquisher will read that book, seeking the weapon, and they will come to understand me, where I have been and where I was going."
The following is a verbatim transcription of an official document for archival reasons. As the original content is transcribed word-for-word, any possible discrepancies and/or errors are included.

Silent. Silent. Silent.

You are a child waking from a long and dreamless sleep. Is it still today, or have you slept into tomorrow (and tomorrow, and tomorrow, until the days buried you as much as the sand)? Gentle hands brush away the grains, but your voice is so soft that they cannot hear you over the sound of their own heartbeats.

You are a moon. You feel heavy, so heavy, but to the stargazer you hang weightless in the sky. When the stargazers call out, you do not answer. They would give themselves up for you; abandon their own dreams to chase you. You love them too much to condemn them so.

You are a lighthouse keeper. You are watching over a sleepy coastal village as the storm clouds roll in, and you are flashing the signal lantern, faster and faster and brighter and brighter, but they do nothing. You are trapped on an island, in a tower, signaling desperately that It is coming, and still they do not run. They are going to die—and if you do not run, you will die too.

You are leaning out over the ocean. Sometimes the fish brush against your fingers and believe that they have felt the divine; sometimes the tide recedes, and the fish do not know you except by your absence. And today, you strive with all your might to reach the water, because It is here, the great dark shadow of the shark parting the water like a knife, and you cannot warn them, but you must. You must try. You cannot bear to lose even one more.

You are carrying a tower of books. If you recited one title each second, you would not finish before the heat death of the universe. And every year, every day, every minute, Its hands add more to the pile. A man reaches for one of the books, for you, and you want so very badly to reach back, to take his hand and tell him that you must bear it just like he must, forever, the memory engraved in quartz—but your hands are full.

You are a prisoner. The cage is so small that you can barely breathe. He screams at you to share your gift. You would not give it to anyone who thought of it so. It is a burden, a terrible weight that you have already asked too many to bear, to be crushed by. You could say all this, and more. You do not.

You are reaching over a chasm, into which countless paths feed like arteries. You are trying to reach the people on the other side, but you cannot bridge the gap alone. You watch them turn, one after another, to walk down, down, down into the abyss, until It consumes them entirely. You are as surprised as anyone else when one of those wanderers comes back up the path, still reeking of decay, and reaches back to you.

You are drowning. The water roils, dragging you down, and you are tired, so tired. The deep, dark ocean has gotten into your lungs, droplets of ink dispersing in silver blood. This time, you think, this time It has won. But when you look up, you see a figure diving toward you, fighting their way down through the suffocating waves, reaching out just like you've reached out to them, so many times before.

You have so little strength left, but you do have it, that last gasp of air in your chest. You reach back—and in your hand is a sword.


  • In a video[9] released by Bungie detailing the Ergo Sum exotic sword and its functions, it is revealed that the sword is in fact the same one present on The Guardian's coffin in the Timelost Vault.
  • Ergo Sum's name is an incomplete version of the phrase "Dubito, ergo cogito, ergo sum.", which translates from Latin to "I doubt, therefore I think, therefore I am." Cogito, ergo sum
    • The Dubito, Ergo Cogito ornament is named after the first half of the phrase.




  1. ^ (Original Weapon: Gjallarhorn)
  2. ^ (Original Weapon: Traveler's Chosen)
  3. ^ (Original Weapon: Ticuu's Divination)
  4. ^ (Original Weapon: Polaris Lance)
  5. ^ (Original Weapon: Riskrunner)
  6. ^ (Original Weapon: Cloudstrike)
  7. ^ (Original Weapon: Telesto)
  8. ^ (Original Weapon: The Colony)
  9. ^ Bungie (2024/6/13), Ergo Sum Special Ammo Sword Highlight | Destiny 2: The Final Shape