Death to the Dorgeshuun

Squeeze through the hole in the wall.

Right click on Kazgar, and use the option "Follow".

Talk to Mistag and ask about the favour.

Alternatively to leave mines, right click on Mistag and use "Follow".

Return to the Lumbridge Castle cellar, dismiss any pets or followers, then talk to Zanik.

Do not teleport or you will lose Zanik. If you lose Zanik at any time, she can be found back in the Lumbridge Castle cellar. You will need to dismiss any pets or followers to have Zanik follow you.

Talk to the Cook inside Lumbridge Castle.

Talk to Duke Horacio upstairs in the castle.

Go east outside the castle on the ground floor for a cutscene.

Talk to an unnamed man or a woman (there are many in the marketplace).

Talk to either the Lumbridge General Store shopkeeper or his assistant.

Talk to Doomsayer near the castle gate.

Talk to the Lumbridge Sage right in front of the castle gate.

Take Zanik to a level 2 goblin across the east bridge.

Make sure to not click while Zanik walks off the bridge of the east side. She starts a dialogue that is easy to click away from accidentally.

Talk to Father Aereck in the church.

Talk to Bob at Bob's Brilliant Axes.

Talk to Zanik.

If she doesn't have the talk option, teleport away and talk to her in the Lumbridge Castle cellar.

After the cutscene, put on your set of H.A.M. robes and prepare to head to the H.A.M. hideout.

Open and then climb down the trapdoor in the Lumbridge forest northwest of the Lumbridge Castle to enter the hideout.

Talk with Johanhus Ulsbrecht (in the southern room) about the cave goblins.

Go next to the southern hanging brazier in the main room - Zanik will spot a trapdoor (Make sure Zanik is beside you and not trapped in the previous room).

Pick-lock on the hidden trap door by right clicking it, then climb down.

In the following section, if any of the guards catch you, you will be sent to jail, which is located on the floor above. Do not worry though; Zanik will pick-lock the door to the jail, but you will have to kill the guards with Zanik all over again.

First guard

Walk west past the first guard

Zanik shoots him.

Second guard

Squeeze through the crack in the wall behind where the first guard stood.

Squeeze through the crack in the opposite wall while the guard in the corridor has his back turned.

Go behind the west guard.

Talk to him for a cutscene, Zanik will kill him.

Third guard

Continue the dialogue with Zanik.

Wait for the central corridor's guard to turn his back / walk away from you.

While the guard is facing away tell Zanik "Now!".

Fourth guard

Go east to the end of the central corridor, but not around the corner.

Wait for Zanik to come behind you near the corner.

Talk to Zanik, telling her to wait.

Head back through the central corridor, down to the south and along the southern corridor to the south-east corner.

The north-east guard follow you.

Zanik will shoot him.

Final Guard

Go to the north end of either the west or east passages, but not around the corner.

Talk to Zanik, telling her to wait again.

Go to the other passage, via the central corridor, and approach the guard (Zanik shoots him).

Listen at the door (you will be caught).

Pick the jail's door lock and leave the H.A.M. hideout.

Pick up Zanik, lying near a tree south of the hideout entrance.

If you have finished the Tears of Guthix quest, you can teleport there with her using a games necklace.

Climb down the trapdoor in the Lumbridge castle, and squeeze through the hole in the cellar wall.

Squeeze through the hole to the south, run south then jump across the stepping stones.

Enter the tunnel to reach the Tears of Guthix cavern.

With Zanik in your inventory and both hands free, talk to Juna.

Collect 20 blue tears from the walls to trigger a cutscene.

Green tears empty your bowl.

Talk to Zanik.

Prepare for the fight against Sigmund and his guards (but keep the H.A.M robes with you). Zanik is considered a follower. Pets and familiars cannot be used during the battle.

Teleport to Lumbridge then enter the castle cellar.

Talk to Zanik and have her follow you.

Go to Seth Groats's farm on the east side of the river near the cow paddock, walk into the fenced area through the gap on the south side.

Unequip any weapons or shields.

Equip full H.A.M. set.

Search one of the empty crates by the tree.

After Zanik climbs in the crate, carry it down into the trapdoor just north of the empty crates.

Go west and walk up to Sigmund, instead of immediately clicking to attack him. You must trigger the dialogue with Sigmund in order to have Zanik attack him, which is needed to complete the quest.

Kill the guards first. This allows Zanik to attack Sigmund who will then switch to Protect from Missiles.

Kill Sigmund, who uses the Protect from Missiles prayer. If he's protecting against your attack style, avoid him so he switches back to Protect from Missile.

Smash the drilling machine at the centre of the room.

Go east then south and unblock the tunnel for a cutscene.

Note: If you forgot your lightsource, it is ok. You will be given a lit torch upon completing the cutscene.

Quest complete!