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Regicide is the fourth quest in the Elf quest series, where King Lathas sends the player to Tirannwn to kill his brother, King Tyras, and end his tyranny.

Official description

Continuing the Plague City series, the Regicide Quest takes you beyond the 'Well of Voyage' to a new realm.

King Lathas will employ you once again, this time for the grim task of disposing of his brother.

Once you have travelled to the realm you will find yourself surrounded by new and strange plants, animals and even a new race.

Once there, you will see that everything is not as serene as it first appears.


Start pointQuest map icon
Quest icon 5th age
After randomly receiving a message from King Lathas's messenger (typically, this happens about 15 minutes after completing Underground Pass).
Member requirementP2P icon Members only
Official difficultyMaster Master
Official lengthLong
RequirementsSkill requirements are not boostable unless marked with a [B] for boostable.
Quest Quests:


  • 60+ Agility Agility (to decrease the chance of failing obstacles in the Underground Pass)
Items requiredItems from the tool belt are not listed unless they do not work or are not automatically added.
Enemies to defeat

One-man army

Meeting with King Lathas

King Lathas gives you your newest mission.

The King's message is received automatically 5-35 minutes after finishing the Underground Pass quest.

After receiving a message from King Lathas, talk to him in Ardougne Castle. He informs you that they have managed to find his brother, King Tyras, with help from the elves; Tyras is hiding in the elven lands along with his troops. Lathas asks you to go through the Underground Pass again and venture into these lands to kill his brother.

If you do not talk to King Lathas before going to the Well of Voyage, Iban will still be there and you will not be able to continue. This means you will need to go through the whole underground pass again.

Underground Pass

Items needed: Bow, arrow, rope, plank (can be picked up en route) and food for lower-levelled players

Before going into the pass, make sure you have all the items you will need to get through it, and to complete a portion of the quest up until you activate the Tirannwn lodestone. Otherwise, if you reach Isafdar and realise you have forgotten something, you will have to make your way through the Underground Pass again, which can be time-consuming. It is also recommended to bring some food for healing, in case you fall down in the pass. This is also an excellent time to complete the "Iban You from Hurting Me" task in the Tirannwn Tasks.

Once you are prepared, return to the Underground Pass. See this separate guide for detailed instructions for getting through the pass and reaching the well.

You should make your way to Iban's Temple, where you defeated him during the Underground Pass quest. Although you might see Iban from outside the temple, it is safe to proceed if you have completed the quest. You can talk to Koftik to obtain some food and also recharge your prayer and summoning points there.

In the centre of the temple is the Well of Voyage; use it to travel to Isafdar.

Isafdar, the elven lands

Exit out of the cave and head a bit west to meet up with an elf named Idris. He starts to mention something about Lathas, but is swiftly gunned down by Morvran and Essyllt. The elf guards will tell you to talk to Lord Iorwerth at the Elf Camp in the north-west corner of the forest. You may now activate the Tirannwn lodestone, which will be helpful throughout the quest.


To travel to the elf camp, you will need to traverse past the obstacles in the elven forest. These traps do not stop forward motion, with the exception of the stick trap; you simply fall right into/over them and take damage. You will need to use the balance log shortcut the first few times you enter the camp.

The Tirannwn lodestone is not far from your current location, hence it is recommended to activate it now for easier travel. Also, if you run out of food, you can kill the rabbits around Isafdar and cook them on one of the fire pits in the elf camp.

While moving around, players may encounter four different obstacles:

Trap Image Description
Dense forest Dense forest Dense forests cannot be failed and it acts as a shortcut inside the forest. However, you cannot pass through these until later in the quest when an elf tracker teaches you the skill; 56 Agility is also required to navigate past them.

If your agility is 51-55 and you are using summer pies/agility potions, there a few things that would come in handy:

  • On the way into Tyras' camp: The boost is only needed on the way in, not when exiting out.
  • Boosts are needed to completely get through a dense forest. If your boost wears off in the middle of a dense forest, you may find yourself stuck.
Leaf trap Leaf trap Occasionally, you will encounter some leaves on the ground. You need to jump over them by clicking in the middle of the trap.

If you do accidentally click on the farther side of the trap, it will result in you walking into the trap and falling into a pit of spikes. This will cause you to lose 361 life points and the only way to escape is by climbing up the wall protrudings.

Stick trap Strick trap You'll see some sticks on the ground in a formation similar to a hurdle. Right-click "pass" on them. If you fail, you'll lose 167 life points and will have to try again.
Tripwire Tripwire Tripwires are armed across two close rocks, flanked by four crossbows aiming at the trespasser.

Make sure run mode is turned off, then click on the tripwire to step over it. If you trigger the trap while doing so, you'll be damaged and poisoned.

Tracker tutorial

Meeting Iorwerth

Meeting with Lord Iorwerth in his camp, who instructs you to speak to his elf tracker.

Once you reach the elf camp, talk to Lord Iorwerth and tell him that King Lathas sent you. He directs you to meet up with his tracker, the one who can guide you to Tyras' camp.

Teleport to the Tirannwn lodestone if activated, or go south-east of the camp until you find an elf tracker, as shown by the map. If you haven't activated the lodestone, do so now as you can avoid going through the Underground Pass again. He doesn't trust your allegiance since you're a human, so return to Lord Iorwerth to obtain a token - a crystal pendant. Talk to the tracker again with the pendant with you, and he'll tell you how to find the camp.

Just a little bit west of the tracker are some footprints heading into the forest; right click and try to follow them and you will be told that you can't. Go back to the elf tracker and he'll teach you how to traverse across the dense forests in Isafdar. Go back and climb through it, with any boost if necessary.

Enemy base


The battle with the Tyras Guard

After you pass through the dense forest, a level 58 Tyras guard will attack you, equipped with a steel halberd. He should be an easy defeat for experienced players; however, players may use prayer and food if the need arises.

After you've killed the guard, continue north, taking caution of a tripwire nearby. After navigating past the tripwire, go through the dense forest up ahead, head west and then south through more dense forest located next to a Tyras guard to reach Tyras Camp. If you ran from the Tyras guard that appeared earlier, you will have to kill him to continue.

Here you will be able to charter a ship to and from Port Tyras, unlocking an alternative route to Isafdar. The trip costs 3,200 coins (This can be reduced to only 1,600 coins or even 800 coins with the ring of charos (a), depending on whether or not the player has completed Cabin Fever).

Once in the camp, speak to General Hining and request to see King Tyras. He tells you that the King doesn't ever entertain an audience and sends you on your way. Hence you must now devise a plan to kill Tyras inside his tent.

While here, grab at least 2 of the barrels that spawn around the camp. An extra barrel of naphtha is needed for Mourning's End Part I, so if you plan on completing that quest, avoid making an extra trip to the camp and grab a few spares in case you make a mistake later.

An explosive plan

Go back to Lord lorwerth, and read the big book of bangs he hands you. Keep the book as you will need it later. You must now follow the instructions in the book to create an explosive compound.

Coal tar exact spot

The location to find the coal tar

  1. Go south of the elf tracker until you come up to a poison waste swamp, where you should find some coal tar. Fill one of your barrels with coal tar by using it on the swamp.
  2. Grab some sulphur lying on the ground nearby and grind it with your pestle and mortar to make ground sulphur.
  3. The third component you will need is quicklime. To make some, use limestone on a furnace. You can mine some limestone in Isafdar, but it may be easier to obtain by buying it on the Grand Exchange, or at the limestone mine near Paterdomus.

Once you have these items, head to Rimmington.


Making naphtha

The interface when making a barrel of naphtha

Go to the chemist's house just west of Rimmington and talk to him. Noting the book Iorwerth gave you, he tells you to use his still to create the required mixture; use your barrel of coal-tar on the fractionation still outside his house.

To operate the still:

  • Rotate the tar regulator clockwise twice, to make the tar flowing at maximum. The 'pressure' indicator on the left should go up.
  • When the pressure enters the green region, rotate the pressure valve clockwise once to let out some pressure. This should stall the pressure indicator.
  • Start adding coal. This raises the 'heat' indicator on the right. If it's below the green region, add more coal. If it's above, don't add coal until it gets lower.
    • If the heat reading reaches the dark orange portion, you've spoiled your compound and must start again.
    • If you run out of coal, your progress will be saved, but you will have to re-set the pressure to add more coal to it.
  • The bar on the bottom should start turning green. When it's full, stop adding coal and close the window to replace your empty barrel with a barrel of naphtha.

It is recommended that you repeat the process to obtain a second barrel of naphtha, if you plan on completing Mourning's End Part I in the future.

Next, grind the quicklime with a pot in your inventory (one can be bought from the general store in Rimmington), to get a pot of quicklime. Be sure to have a pot in your inventory before grinding or else the quicklime will disappear and you will need to heat another piece of limestone.

Add the pot of quicklime and ground sulphur to the naptha mix, producing a barrel bomb. Finally, use the strip of cloth on the bomb to complete it.

Catapulted into oblivion

Items needed: Barrel bomb and a cooked rabbit (can be bought in raw form from a charter crewmember, and cooked anywhere in Isafdar)
Barrel bomb exploded

The barrel bomb destroying Tyras' tent

Head back to Tyras' camp using a charter ship to Port Tyras. Cross the dense forest north of the camp and offer the cooked rabbit to the plainclothes Tyras guard near the catapult, as a distraction. Free from any interference, use the barrel bomb on the catapult.

You will see the bomb hit King Tyras' tent and burn it to the ground. Go back to Lord Iorwerth, who gives you a sealed message to take to King Lathas, also granting you access to the overpass of Arandar.

Make sure you have the letter before transporting away. If however, you have a clue scroll in your inventory meant for Lord Iorwerth, you must either complete it, drop it, or bank it before moving on with the quest.



Arianwyn shows you what the message really says, and recruits you to his side.

Travel back to Ardougne Castle by any method you want. On the way to delivering the message, an elf named Arianwyn suddenly appears before you. He breaks the magic seal on the letter and asks you to read it.

In the letter, Lord Iorwerth assures King Lathas that Tyras has been killed and that the Dark Lord can enter Gielinor. Arianwyn further reveals the "path" is connected to Zamorak's realm, and convinces you to join his side instead. Not to arouse any suspicions, Arianwyn tells you to claim your reward from Lathas.


Regicide reward
Music unlocked

Required for completing

Completion of Regicide is required for the following:


Cultural references

  • The barrel bomb has a real life parallel - Greek Fire, which ignites on contact with water and is very hard to put out once it begins to burn.
  • Naphtha was used in Mongol siege warfare, during the reign of Genghis Khan. It is thrown by a catapult and catches fire when airborne.
  • Regicide is the act of killing a monarch, specifically a king.
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