Adept weapons

Adept weapons are a distinct group of Legendary and Exotic weapons first appearing in House of Wolves within the Trials of Osiris that contain extra intrinsic perks. In Destiny 2, Adept weapons are exclusively legendary weapons, contain two exclusive perks, have special mods only available on Adept weapons, and give bonus stats upon masterwork.

=Destiny= House of Wolves marks the first time Adept weapons were introduced, acquired from the chest within The Lighthouse by getting a flawless card in the Trials of Osiris.

House of Wolves
Adept weapons earned during this time were given a random element, instead of kinetic damage.

Trials of Osiris

 * The Summoner (Adept) - Legendary Auto Rifle
 * The Scholar (Adept) - Legendary Scout Rifle
 * The Messenger (Adept) - Legendary Pulse Rifle
 * Jewel of Osiris (Adept) - Legendary Hand Cannon

The Taken King
Adept weapons earned during this time were intrinsically given the perk Last Resort: Delete once Last Resort page is made
 * This weapon handles and reloads faster when the wielder is the last living player of their Fireteam.

Trials of Osiris

 * Doctrine of Passing (Adept) - Legendary Auto Rifle
 * The Inward Lamp (Adept) - Legendary Scout Rifle
 * Reflection Sum (Adept) - Legendary Pulse Rifle
 * The Water Star (Adept) - Legendary Hand Cannon

Rise of Iron
Adept weapons earned during this time were intrinsically given the perk Snapshot: Delete once Snapshot page is made
 * Aiming this weapon is incredibly fast.

Trials of Osiris

 * Vision Stone (Adept) - Legendary Auto Rifle
 * Burning Eye (Adept) - Legendary Scout Rifle
 * Blind Perdition (Adept) - Legendary Pulse Rifle
 * Exile's Student (Adept) - Legendary Hand Cannon

Age of Triumph
With the introduction of Age of Triumph, the first and only set of Exotic Adept weapons were made available from completing encounters within the Weekly Featured Raid. All Adept raid weapons are elemental, with Vault of Glass and Crota's End weapons retaining the same elements as their Year 1 counterparts.

Vault of Glass

 * Atheon's Epilogue (Adept) - Exotic Void Auto Rifle
 * Vision of Confluence (Adept) - Exotic Solar Scout Rifle
 * Praedyth's Timepiece (Adept) - Exotic Arc Pulse Rifle
 * Fatebringer (Adept) - Exotic Arc Hand Cannon

Crota's End

 * Abyss Defiant (Adept) - Exotic Solar Auto Rifle
 * Fang of Ir Yût (Adept) - Exotic Arc Scout Rifle
 * Oversoul Edict (Adept) - Exotic Arc Pulse Rifle
 * Word of Crota (Adept) - Exotic Void Hand Cannon

King's Fall

 * Anguish of Drystan (Adept) - Exotic Arc Auto Rifle
 * Doom of Chelchis (Adept) - Exotic Void Scout Rifle
 * Smite of Merain (Adept) - Exotic Solar Pulse Rifle
 * Zaouli's Bane (Adept) - Exotic Void Hand Cannon

Wrath of the Machine
Wrath of the machine weapons feature a different naming scheme, instead putting double parenthesis around the name to signify it being adept.
 * ((GENESIS CHAIN~)) - Exotic Solar Auto Rifle
 * ((CHAOS DOGMA~)) - Exotic Arc Scout Rifle
 * ((STEEL MEDULLA~)) - Exotic Void Pulse Rifle
 * ((FEVER AND REMEDY~)) - Exotic Solar Hand Cannon

=Destiny 2= Adept weapons debuted for the fist time in Destiny 2 inside of Season of the Hunt. Getting an Adept Trials of Osiris weapon is the same as it was in Destiny, requiring a flawless trip to the lighthouse and an opening of the chest. New types of weapons can also be Adept, including special and heavy weapons. Season of the Chosen added Adept variations of Nightfall weapons, which have a chance of dropping from the Grandmaster difficulty.

Adept weapons have a special set of Adept mods that can be earned at the same time as Nightfall or Trials of Osiris Adept weapons. Masterworking an Adept weapon also gives a bonus to other stats not focused by the masterwork.

All Adept Trials of Osiris and Nightfall weapons that drop after the release of Season of the Splicer contain an extra perk in the third column, Celerity and Bottomless Grief respectively. Increased target acquisition Increased handling and reload speed Reduced flinch from incoming fire
 * Celerity: Increases weapon handling and reload speed. Gain the following effects while you are the last living member of your fireteam:

Delete once Both pages are made
 * Bottom Grief: Increases magazine size. While you are the last living member of your fireteam, each final blow refills your magazine.

A rework that came with the release of Season of the Lost allows two more ways to get Trials of Osiris Adepts, continuing to get wins on a flawless passage or focusing Trials Engrams with Saint-14 to acquire rolls of previously earned Adept Trials of Osiris weapons.

Trials of Osiris

 * The Summoner (Adept) - Legendary Solar Auto Rifle
 * The Scholar (Adept) - Legendary Scout Rifle
 * Astral Horizon (Adept) - Legendary Shotgun
 * Exile's Curse (Adept - Legendary Arc Fusion Rifle
 * Eye of Sol (Adept) - Legendary Sniper Rifle
 * Tomorrow's Answer (Adept) - Legendary Void Rocket Launcher

Trials of Osiris

 * The Messenger (Adept) - Legendary Pulse Rifle
 * Igneous Hammer (Adept) - Legendary Solar Hand Cannon
 * Sola's Scar (Adept) - Legendary Solar Sword

Nightfall

 * Shadow Price (Adept) - Legendary Arc Auto Rifle
 * The Palindrome (Adept) - Legendary Void Hand Cannon
 * THE SWARM (Adept) - Legendary Arc Machine Gun

Season of the Splicer
Season of the Splicer introduced a new type of Adept weapon, Timelost weapons, exclusive to the Vault of Glass raid's Master mode. Each week features a new encounter challenge, rotating on a weekly basis, for a total of five weeks, with the Timelost Found Verdict being awarded through a triumph after collecting all other Timelost weapons.

Timelost weapons are guaranteed to have a selectable second perk in the third and fourth column that is static on each weapon, effectively reducing the luck required for a specific roll. Timelost weapons also have access to all Adept Mods, and gain a bonus to other stats after masterworking.

Trials of Osiris

 * Shayura's Wrath (Adept) - Legendary Void Submachine Gun

Nightfall

 * Hung Jury SR4 (Adept) - Legendary Scout Rifle
 * PLUG ONE.1 (Adept) - Legendary Arc Fusion Rifle
 * Uzume RR4 (Adept) - Legendary Solar Sniper Rifle

Vault of Glass

 * Vision of Confluence (Timelost) - Legendary Solar Scout Rifle
 * Fatebringer (Timelost) - Legendary Hand Cannon
 * Found Verdict (Timelost) - Legendary Arc Shotgun
 * Praedyth's Revenge (Timelost) - Legendary Sniper Rifle
 * Hezen Vengeance (Timelost) - Legendary Solar Rocket Launcher
 * Corrective Measure (Timelost) - Legendary Machine Gun

Trials of Osiris

 * Reed's Regret (Adept) - Legendary Stasis Linear Fusion Rifle

Nightfall

 * The Comedian (Adept) - Legendary Void Shotgun
 * The Hothead (Adept) - Legendary Arc Rocket Launcher

=List of appearances=
 * Destiny
 * House of Wolves
 * The Taken King
 * Rise of Iron
 * Age of Triumph
 * Destiny 2
 * Season of the Hunt
 * Season of the Chosen
 * Season of the Splicer
 * Season of the Lost

=References=