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Duality is the Destiny 2 dungeon set inside the mind of Emperor Calus, and this lot plays it for your Guardian from the first encounter to the final boss. The Difficulty list covers Normal and Master runs, last-boss-only runs, and Solo Non-Flawless or Solo Flawless completions.
| Dungeon | Duality, set in the mind of Emperor Calus on the Derelict Leviathan |
|---|---|
| Fireteam size | Up to 3 Guardians |
| Exotic | Heartshadow (Void Sword); the drop chance is boosted by Duality triumphs |
| Legendary weapons | Stormchaser, Unforgiven, Lingering Dread, New Purpose, The Epicurean, Fixed Odds |
| Armor set | Deep Explorer |
| Seal title | Discerptor (Duality) |
| Master reward | Mandate of Strength ship from the Master Thoughtstealer triumph |
| Access | Dungeon Key, included in Destiny 2: The Collection |
The dungeon pool holds six Legendary weapons: Stormchaser (Arc Linear Fusion Rifle), Unforgiven (Void SMG), Lingering Dread (Stasis Grenade Launcher), New Purpose (Stasis Pulse Rifle), The Epicurean (Void Fusion Rifle) and Fixed Odds (Solar Machine Gun), plus the Deep Explorer armor set for every class. Since Update 9.7.0 dungeon gear drops with Gear Tiers: a Master run drops Tier 5 weapons and armor, while a Standard run drops Tier 5 only when the dungeon is one of the two featured that week.
Heartshadow is a random drop. The game data lists drop-chance boosts on the Duality triumphs: Mind Heist (steal Calus's repressed memories), Solo Thoughtstealer, Master Thoughtstealer and the flawless pair each raise its starting chance, which is why the form offers the Mind Heist triumph as an add-on.
Master Duality has its own triumph, Master Thoughtstealer, which unlocks the Mandate of Strength ship and adds to the Heartshadow chance. Master runs drop Tier 5 gear.
Yes. Normal Last Boss Only and Master Last Boss Only are separate Difficulty choices for players who need just the final encounter.

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