The Law of the Order is a Quest in Divinity: Original Sin II.
- Investigate the Dwarf Lohar's involvement in Driftwood
- Find evidence
- Report it to the magisters
This quest is acquired by speaking with Magister Reimond in Driftwood. Speak with Magister Julian to get more specific instructions immediately after speaking to Reimond. Lohar, the local gang boss can provide some useful information, provided you be careful. He can be found at Undertavern. In Driftwood Fishery, you can learn that Void-Tainted Fish are bought by someone in Arx by speaking with Brayton Barnes (it doesn't seem possible to pass any of the checks).
If you deliver Mordus' note to Lohar in Shadow over Driftwood quest, you will learn that Lohar's men have stolen some Magisters' cargo. In the depth of Wrecker's Cave, you can find some letters and a ship manifest, mentioning a Deathfog delivery device was stolen. Running up to the basement after you defeat Mordus, along the way you will pass an open room with a letter from the Dwarf Queen. Pick it up and read it so the quest updates.
You can give the letter to Lohar, the quest is closed. If you give it to Magister Julian, you will have to kill Lohar and bring his head to Magister Julian to close the quest.
Warning: Giving the note to Magister Julian will instantly make enemies out of everyone in the Undertavern after you talk to Lohar, which means you will lose access to a few merchants. Giving it to Lohar instead is the safer path to take and doesn't hurt relationships with anyone.
Secret: If you go to the Driftwood Fishery, there is a hidden hatch leading to a cellar, located where the dog is. The cellar is booby-trapped, and has decent loot. At the end of the cellar (which is the other side of the door), there is a Marked Barrel with Soulforged weapons for you to loot. Opening the crate will reveal that the dwarves have been transporting contraband.
Looting the weapons will spawn many Voidlings, so be sure to have your entire party with you. Luckily, the Voidlings are extremely weak to fire, and there are plenty of barrels around, so feel free to ignite the entire area for an easy AoE wipe. The Voidlings all drop really nice loot, making the fight totally worth it.
Bug: If you killed Mordus and obtained his amulet, you will be unable to give the note to Lohar as the Shadow over Driftwood quest will take precedence and prevent you from seeing the option to give Lohar the note. If you tell Lohar to deal with the Deathfog himself, he will leave, making this quest impossible to complete except by handing the note over to Magister Julian, who will only tell you to find and kill Lohar. Instead of telling Lohar to deal with the issue himself, you must offer to go to Arx and correct the issue for him, or else he will depart after you give him Mordus's amulet and you will be unable to give him the note.
Bug 2: There have been many reports that it is easy to lose the note because it is not designated as a quest item (and therefore not immune to alteration), so be sure to complete this quest as soon as possible in order to avoid that situation.