The Chosen Commander

Climb the nearby stairs (slightly north of Undak) and talk to Torzek outside the nursery.

Talk to any nearby child against the building wall about what they ate.

Andil: The chat options may vary from person to person.

Delgon:

Gerdi:

Talk to Captain Undak. (If you are unable to talk with Captain Undak, make sure you do not have "Hide Familiar options" checked under Settings>Combat & Action Bar>Choose Option Menu and log out and back in)

Go down the stairs and head south to the market.

Talk to Markog, at the south-eastern-most stall of the market.

Talk to Turgok, at the south-western-most stall of the market.

Talk to Merchant Walton, just outside of the market to the south-east.

Proceed to kill the merchant (Zanik will switch to melee if you use ranged).

Talk to Zanik.

Climb on the goblin south-west of the bowl statue.

Jump on statues to reach the statue holding the bowl of water.

If the jump-on option does not appear, try clicking on the head.

Continue jumping north and take the crossbow from the ledge.

Grapple the spear of the north-eastern statue and take the pendant.

Look into the bowl.

Enter the western portal (the statues will move out of the way) for a cutscene.

Continue conversation with Zanik.

With Zanik following, go to the north end of Dorgesh-Kaan and up the northern most set of stairs.

Watch the cutscene.

Continue conversation with Captain Undak.

Run south of the city, up and over staircases until you reach the agility course. Bring a light source.

Climb-down the ladder top and head all the way south.

Talk to Zanik.

Watch the cutscene.

After the cutscene talk to Zanik.

Talk to Captain Undak for a set of H.A.M. robes.

Prepare for battle, but only wear the H.A.M. robes.

Enter the H.A.M. Hideout in Lumbridge forest.

Talk to Johanhus Ulsbrecht in the centremost of the three southern rooms.

Before you do, make sure to wear all of the H.A.M. robes

Talk to Milton in the windmill near the Fishing Guild, north of the Ardougne lodestone.

Climb down the ladder inside the windmill.

Run directly east through the door, continuing east through stacks of crates.

Talk to the guard next to the prison.

Enter the main area (back through the doors to the west) and pickpocket Sam.

Return to the prison guard.

Enter the prison and take the key, open the gate.

Escape with Grubfoot:

Talk to the prisoner, Grubfoot.

Run into the kitchen, squeeze through the hole.

Open 1 of the 2 doors.

Go back through and open the other door as well.

Return to Grubfoot.

Stand north of the guard, talk to him to face you and have his back turned. After selecting the chat option, do not continue the conversation until Grubfoot walks past the guard into the next room.

Talk to Grubfoot in the next room.

Squeeze into the kitchen. Take the dirty plates from the sink, and wait for the H.A.M. guard to come talk to you.

Talk to Grubfoot in the bedroom.

Exit the east door and run to the big doors north.

Watch the cutscene and wait for Sigmund to confront you.

Kill Sigmund.

If Zanik doesn't attack Sigmund, climb up the ladder, then back down.

Kill Zanik repeatedly.

Turn off revolution in combat settings and avoid using bleeds and channelled abilities as they cancel the dialogue forcing you to repeat the phase.

If revolution was left on and dialogue interrupted, run up and then down the ladder to the west to avoid having to fight again.

Run west for an earthquake.

Right click Clear the fallen rocks.

Talk to Zanik.

Go through the cave and talk to Juna.

Run north-west to exit the cave.

Go over the stepping stones and run directly north.

Squeeze through the hole.

If you don't have the shortcut unlocked, you'll have to go all the way around towards Lumbridge Castle's Cellar.

If at any point Zanik stops following you, she can be found back at Juna.

Right click Follow Kazgar.

Enter Dorgesh-Kaan and talk to Captain Undak north of the market (between the fountains).

Climb the northern stairs for a cutscene (close the Bandos's Ultimatum screen that pops up).

Climb back up the stairs, talk to the Goblin scribe.

Climb down the stairs and run south-east through a corridor (near the quest start point).

Talk to Tegdak in the north-east room of the ground floor.

Return to the Goblin scribe upstairs.

Exit the city through the bone door north-east, downstairs.

Talk to Mistag.

Return to the city and talk to Oldak north of the bank.

if invention has been unlocked.

Return to the agility course (south end of Dorgesh-Kaan) - do not climb down the ladder.

Run east to the power station and climb down the stairs.

Talk to Turgall, make sure you have at least 2 free inventory spots.

Talk to Oldak, now south-east of the market.

Talk to Zanik.

Talk to Mernik in the children's nursery north-east upstairs.

Talk to Ambassador Alvijar in the house north-west of the nursery.

Return to Mernik.

Prepare to fight enemies weak to magic.

Talk to Zanik, south-east of the market.

Defeat the Bandos avatar.

Pick up all 4 parts of the crossbow while killing statues.

Use the crossbow pieces on each other.

Kill the avatar again.

Take the avatar's pendant.

Talk to Zanik.

Exit through the portal.

Click the screen to exit cutscene.

Quest complete!