Andor's Trail

I had expected some form of appreciation from Throdna for helping him learn more about the ritual and for purifying the shrine. But he seemed more occupied with rambling on about Kazaul.

North, from the entrance to the Black Mountain

--and, yes, kill--that growly wolfhound Before coming across Hettar..

Don't always shoot first and forget questions later

Once you completed all of the BWM Quests.

You need Lodar's potions and those are:
(One of the options is valid) "Minor Potion of Strength", "Potion of Improved Defense", or "Lodar's Perilous Concoction"
and liquid container(s) from Fallhaven's Potion Merchant specifically
either 1 liquid container of "Empty Flask" or 2 liquid containers of "Empty Potion Bottle"

as you venture to the location ("foot of the mountain's south east of Prim")
or in terms of direction -
Go to the SOUTH of Prim's Settlement, then EAST, and then NORTH.

Once you are there, keep walking upward until you notice a new hole. Fetch the rope inside of a new basket (with a color green in the middle) located on the south of the new hole to climb down.

Once you climbed down the rope- you will notice snakes on the south, riverbank on the east, and path way to the west.
Go to your WEST.
Keep exploring and searching until you searched the remains of the 3 skeletons and found the horrible scene.
Climb up and go back to the Prim Settlement and you will meet and speak with a new NPC, namely Ehrenfest, standing outside of the Prim's Settlement's Guardhouse.

After making your own choice about whether you should go inside of the Prim's settlement's Guardhouse or not. If you go inside, then you must talk to him again. Else, if not, then go straight to the Elm mine but go east of it (where Arghest is located).

In terms of conversation about the case: talk to "Prim Evoker" (strolling behind of Prim's settlement's Guardhouse), "Moyra" (standing around the corner of Prim's settlement), then "Prim resident" (walking behind of Prim's Settlement's well), and then "Jern" (boozing inside of Prim's Settlement's tavern).
You have to go back down again to the new hole BUT go to your SOUTH this time to scoop, with the use of mentioned liquid container(s), a cold mountain water and give it to Jern.

Now, make your own choice - Ehrenfest or Jern. If you sided with Jern (by not trusting Ehrenfest), then talk to Jern again about solving the case by your own self, and then follow his order. Else if not, then go straight to the BWM's settlement's Inn (where the first battle of this quest takes place).

BTW, if you sided with Ehrenfest, then you will have a talk with the Subdued Feyard Mountain Scout inside of the BWM's cabin. Else, if not, then you will have a fight with her before the entrance of the BWM (where "wyrm apprentice" is spotted).

After the first battle, follow the command of General Ortholion- go back down to the South of Prim's Settlement to talk to and warn the "Feygard Mountain Scout"(one of the General Ortholion's henchmen), and then head straight inside of Elm mine. Go deeper below Elm mine until you see General Ortholion fighting with the NPC.

Join the fight. After that, go back up to the Elm mine and go east of it (where Arghest is located) to meet up with General Ortholion. Finally, make your own choice to settle his debt to you.