Regicide/Quick guide

Starting out

 * Talk to King Lathas in Ardougne Castle
 * Travel through the Underground Pass which can be found on the far west side of West Ardougne. Refer to this guide if you get stuck.
 * Enter the well in Iban's Temple.
 * Exit the cave to the west.

Tirannwn

 * Run through the forest, talk to Idris.
 * Run south, jump the leaves trap, pass the sticks west of the musician.
 * Continue south and activate the lodestone.
 * Follow the path north west until you reach a camp.
 * Talk to Lord Iorwerth.
 * Teleport to the lodestone, talk to the elf tracker.
 * Talk to Lord Iorwerth again.
 * Talk to the elf tracker again.
 * Click the tracks a few steps west.
 * Talk to the elf tracker.
 * Climb through the dense forest, kill the guard.
 * Go north, through more dense forest.
 * Run west then south, talk to General Hining in the camp.
 * Take 2 barrels (you will only need 2 if you plan on completing Mourning's End I).

Sabotage

 * Talk to Lord Iorwerth. Read the book.
 * Use a barrel on the tar south of the tracker. (There is a very small area where you can do this, directly south of the tracker's cart
 * Take some sulphur, grind it.
 * Use limestone on any furnace.
 * Talk to the chemist in Rimmington. (If you don't, the Quest Journal will not update!)
 * Use your barrel of tar on the fractionation still outside (complete this process twice, if you plan on completing Mourning's End I, barrel of naphta is required for that quest).
 * Operate the still:
 * Click the right half of the tar valve.
 * When the pressure dial is  green , click the right half of the pressure valve.
 * Add a few coal and keep the heat in the  green .
 * Keep it balanced until the bar at the bottom is full. Close the interface.
 * Grind the quicklime into your pot.
 * Use the quicklime, sulphur and cloth on the barrel of naphtha
 * Charter a ship to Port Tyras or use the Tirannwn lodestone, run to the catapult north of the camp.
 * Feed the guard a cooked rabbit. Use the bomb on the catapult.
 * Talk to Lord Iorwerth.

The Lord's message

 * Attempt to enter Ardougne Castle.
 * Talk to King Lathas.
 * Quest complete!