Lagromar - Borderlands 3 Farming Guides
Location: Konrad's Hold on Pandora
Part of: The Demon In The Dark Side Quest
Drops: The Flood (Jakob's Pistol) and Long Musket ++ (Tediore SMG)
Lagromar is found in Konrad's Hold on Pandora and can only be accessed if you are currently on or have completed "The Demon In The Dark" side quest. You'll be able to pick this quest up any time after completing the Angels and Speed Demons Story Quest in the area around where you find the Manvark Target of Opportunity.
If you are like everyone else and having trouble figuring out how to activate the Eridian Ruins for The Demon in the Dark side quest I recommend you watch my video, How to activate the Eridian Ruins for The Demon in the Dark. Where you stand when you shoot through the rings matters, that's the whole troublesome part.
As far as loot goes, The Flood (Jakob's Pistol) and Long Musket ++ (Tediore SMG) are both on Lagromar's dedicated drop loot list. They have a higher chance to drop from him but are also easily found elsewhere in the world.