Garriden Loch is a Named Enemy in DLC3 of Borderlands 3. He is also on the “Most Wanted” list. Garriden Loch is located in Ashfall Peaks on the Planet Gehenna. You will encounter him in the back area of Pilfertown.
You can farm Garriden Loch for the Robin’s Call as it is the dedicated loot source for this item. Robin’s Call has a 33% drop chance.