Credit to @Jefe for the idea, @Slif_One for the nudge that got me to open the thread, and @Enderborn1 for inspiring it with his love letter to the Sincero Amigo.
The aforementioned Ballad of the Sincero Amigo by @Enderborn1, because it should be required listening.
[Link to screenshots of the new heads and skins available in the new DLC] (New Skins and Heads : DLC 5)
Courtesy of @Jefe.
Maps of the new DLC, helpful for chest farming and route planning.
Some info concerning the Toothpick you may want to have a look at.
Intended to be a list of new gear introduced in the latest DLC. Hopefully with sources and special effects. This post will be essentially naked until I have a few extra minutes to start collating the data already in other threads. Feel free (and encouraged) to post submissions in this thread and I’ll try to update it as often as possible. (Free likes as I like every response in a thread I start.) Information considered pertinent for the purposes of this thread: gear type, source, element where applicable, special effect and red text. Help with formatting always appreciated.
List to be formatted and made pretty later. Effervescent unless otherwise labeled. (All information used is gleaned from the wiki. Any further info will be incorporated and credited moving forward.)
Hector’s Paradise (legendary)
The Whip at New Pandora’s Backs
Shock element Dahl pistol with a melee attachment (shock Hornet)
Echoes of the Past mission reward
Sincero Amigo (legendary)
A True Friend Can Penetrate Any Barrier
Bypasses all shields (transfers to vehicle guns)
Jakob’s sniper rifle with increased base damage and melee attachment
Mission reward for BFFFs.
Writhing Deep Set:
Toothpick
A simple solution to a dire problem.
Incendiary Dahl assault rifle
Drops from Sandworms
Mouthwash (Eridian)
Gargle and spit. – Increases Toothpick damage
Mission reward for Paradise Found
Retainer (Hyperion: Maylay, that’s right, Maylay shield)
Retains your guts inside your body, where they belong. Increases speed and jump height when equipped with the Toothpick in Writhing Deep. (Identical stats to an Order shield with the same parts)
Drops from Sandworms
Digistruct Peak Set (all drop from Haderax the Invincible):
Peak Opener (Torgue)
Top-tier pick for optimal play. – Always shock. Fires rockets that drop 3 child grenades on impact. Child grenades deal explosive damage. Increased fire rate when zoomed in. Consumes 4 ammo per shot.
Hard Carry (Eridian)
Tough to lose when you’re this broken.
Increases Fight for Your Life time and health when worn with Easy Mode.
Easy Mode (Maliwan)
Keep the pressure up without getting bodied.
- Increased capacity and nova damage. Reduced nova radius. (Always shock element)
- Increases Peak Opener damage in Digistruct Peak.
- Increases Fight For Your Life Time and health while on Digistruct Peak with the Hard Carry equipped.
Infection Cleaner (Tediore)
Shhhhh. I’ll take care of everything.
Always incendiary. Behaves like a Bouncing Betty Grenade when reloaded. Regenerates SMG ammo when wielded. (Incendiary locked Avenger)
Drops from New Pandora soldiers
Winter Is Over (Blue/Unique)
Winter is Over is a unique relic manufactured by the Eridians. Winter is Over is dropped by Ghost in The Burrows. (Functionally identical to an incendiary relic and a possible Purple rarity spawn, as per @Slif_One. Thank you.)
M2828 Thumpson (legendary)
Every soldier has 2 families: The one you raise and the one you raise hell with.
Increased damage, critical hit bonus and magazine size. (A more stable and accurate Hammer Buster.) Farmable with repeated pokes at the grave between save/quit cycles.
Drops from a marked grave in the Dahl abandon. Can reset the grave by exiting the map and then returning. No save/quit required.
Grave Location
Hot Mama (Jakobs)
Sniper is a lonely occupation.
Always Incendiary. Unique voice module. Increased damage, accuracy, reload speed and magazine size. Bolt action fire rate. Fixed melee attachment. Projectiles have a trail of purple hearts on either side of the bullet path.
Drops from Lt Hoffman in Mt Scarab Research Center
World Burn (Torgue)
War does not compute.
Always incendiary. Rockets fly in an arc and explode in a mushroom cloud. Increased damage and magazine size. Reduced reload speed.
Drops from Lt Bolson in the Dahl Abandon
Nirvana (Maliwan)
Look, life’s a bitch. Get over it. Burn something to the ground.
Always incendiary. Slightly reduced bullet damage and accuracy. Increased magazine size, elemental damage and elemental chance. 50% splash damage. (Hellfire with a shiny skin)
Drops from Infected Badass Saplings
Antifection (Vladof)
By fire be purged.
Deploys like a tesla grenade which then sends out tiny grenades exploding when hitting the ground.
Drops from Cassius (incendiary locked grenade, similar to a Fire Bee but with explosive MIRV bomblets.)
Electric Chair (Vladof)
The truth is often the best shield.
Launches eight smaller range, child Tesla grenades in an even distribution around the deployment point. When the child grenades are first sent out, there is a shock explosion within the range of the Tesla.
Drops from Uranus (heh. I typed Uranus. Heh.)
Unicornsplosion (Torgue)
A magnificent gift from a dear friend neither forgotten nor forsaken.
Fires a miniature Butt Stallion which explodes upon impact, spawning three smaller projectiles, which also explode on impact. Consumes 2 ammo per shot. (What it sounds like. A shiny rainbow skinned SWORDSPLOSION!!! that fires Unicorns instead of swords.) Drops from Butt Stallion the first time you feed her in the Backburner while wearing the Mysterious Amulet from Mr Miz. Once per character. 
Overcompensator (Legendary Hyperion Shotgun)
You can either surf or you can fight.
Unique voice module. Reduced pellet count. Increased accuracy, fire rate and magazine size. The magazine has a chance to refill a random amount of ammo when fired. Consumes 1 ammo per shot.
Mission reward for Chief Executive Overlord
