Memento Vivere:
Rare, Necklace

When worn by an Adventuring Partner that is imprinted, their imprint will not wear off when they long rest. An imprint extended this way will end when the necklace is removed.

Found: Act 1, in Grymforge, among the Shar Tablets. Act 2, in the Gauntlet of Shar on a table in the shattered Mirror of Loss room; and one in Melodia's Bedroom in Moonrise Towers. Act 3, in the Night Orchid room in the House of Grief.

Shepherd's Ring:
Very Rare, Ring

Gives +1 AC and +1 to Saving Throws to the summoned creatures/followers of the creature wearing this. If worn by an Adventuring Partner, it instead grants this bonus to the Duo.

Found: Sold by Quartermaster Talli at the Last Light Inn

Whiplash Staff:
Rare, Quarterstaff

Grants access to the Contrecoupe cantrip, a bonus action cantrip that you can only cast if another allied creature has attacked during your turn, requiring shared initiative, or to be a Duo. Spellslingers and Apprentices add their spellcasting modifier to the damage of this cantrip.

Found: Sold by Lady Esther in the Mountain Pass

Squire's Colours:
Uncommon, Cloak

If worn by a Squire, makes Fighting Fit give +1 to Saving Throws as well as AC.

Found: One in the washroom in Waukeen's Rest, one sold by Dammon, one sold by Gloomy Fentonson (the armour trader opposite Fytz in Baldur's Gate).

Apprentice's Conical Hat:
Uncommon, Hat

If worn by an Apprentice, gives Selfless Spells a range of 15ft.

Found: One on the table in the basement of the Potion Shop in the Blighted Village, one sold by Derryth Bonecloak, and one sold by Araj Oblodra.

Lackey's Gumshoes:
Uncommon, Boots

If worn by a Lackey, their Cunning Companion ability that prevents Attacks of Opportunity from enemies does not end when their reaction is used.

Found: One by the ladder in the entrance to the Zhentarim Hideout under Wuakeen's Rest, one sold by Sticky Dongo, and one sold by Roah Moonglow.

Elixir of the Tactician // Strategist
Rare/Very Rare, Potion

Elixirs that grant 2/4 Tactic Points to the drinker. Lasts until long rest, and replaces the effects of other elixirs.

Found: Sold by vendors. One Tactician potion found on Minthara's desk in the Goblin Camp, one Strategist potion found in Ketheric's room in Moonrise Towers.

Encoder/Decoder Rings
Legendary, Ring

A pair of rings that work together. The Encoder Ring has a spell called Form Duo that can only target the wearer of the Decoder Ring. The spell combines and shares the hitpoints and action resources of the two characters, and they share initiative just like a Duo and their Adventuring Partner. Obviously, if a Duo uses this ring, they can form a Trio, or a Quartet if they target another Duo.

If a creature wears both rings and targets themselves, or a Duo targets their own Adventuring Partner, they gain the Closed Circuit condition instead, which grants immunity to psychic damage and most mental debuffs.

Found: The Encoder is found on the round table in the Headquarters of the Knights of the Shield. The Decoder is with Duke Stelmane's hand, which is in Dolor's Hand Bag.

Planar Electrum Alloy
Legendary, Misc

A chunk of metal dropped by the Steelwatch Titan. Used by the JWL Crafting Framework to upgrade your Adventuring Partner's starting gear into a legendary variant.

Found: Dropped by the Steelwatch Titan.

Legendary Dreamwalker Armour
Legendary, Armour

Gives +2 to AC, +1 to Saving Throws of an Adventuring Partner wearing it, and prevents the partner from disappearing if their Duo dies - while also giving them a use of Revifiy once per day that can only target their Duo.