Leech Collector is a series of open-world events at Ambrus's leech camps in the swamps. Clearing them and wrecking the barrels raises Ambrus's anger, and the last camp hides a mini-boss.
Clear the camp, then destroy the leech barrels. At Bounty of the Mire the collectors are ordinary people who try to talk you out of it, but you can smash the barrels anyway. Wetland Helpers is a night camp with a plain guard rotation.
They are part of Ambrus's 14 court activities. Fill his anger meter and The Gilded Gauntlet unlocks. The camps sit in Briar Sloughs.
Image: Rebel Wolves / Bandai NamcoAmbrus's Cellars
Ambrus's Cellars are the court activities where you raid the hidden blood stores of the vampire Ambrus. Each cellar you clear raises his anger, which is how you unlock the duel with him.
Image: Rebel Wolves / Bandai NamcoAmbrus's Cellars: Trouble Brewing
Trouble Brewing is the Ambrus cellar hidden in a guarded house in Svartrau City. Spare the alchemist upstairs and you walk away with a Lasting Malediction Manual and a potent Razor Claw vial.
Ambrus's Cellars: Uninvited
Uninvited is the Ambrus cellar near St. Tyna's Grove, an outpost with ruins below it. It is the toughest of the three cellars because a named murohn guards the blood stock.
Image: Rebel Wolves / Bandai NamcoAmbrus's Dungeons
Ambrus's Dungeons are court activities where you break into Ambrus's prisons and decide what happens to the people inside. They count toward his anger, which unlocks the duel with him.