OSRS Underground Pass Quest Guide: 25 Ranged, Grid and Iban

Overview

Underground Pass needs 25 Ranged, which can be boosted, and Biohazard, which needs Plague City. Start by talking to King Lathas on the 1st floor of Ardougne Castle (2nd floor in the US), then walk to the cave at the west end of West Ardougne where Koftik is waiting. It is a members quest, Experienced and Long, and part three of the elf series.

The dungeon is the hard part. You lower a bridge with a fire arrow, swing across a pit on a rope, cross a grid where every wrong tile drops you for 15 damage, collect four orbs of light for a furnace, then work through the lower caves to build a doll of Iban. The fights are three level 91 demons, three level 62 paladins, Kalrag (level 89) and a level 13 disciple of Iban. The demons, paladins and Kalrag can all be safespotted, and Iban himself dies when you drop his doll into the well in his temple.

Rewards are 5 quest points, 3,000 Agility and 3,000 Attack XP, Iban's staff with the Iban Blast spell, and Klank's gauntlets. Regicide, Legends' Quest, Freeing Sir Amik Varze and the medium Ardougne Diary all need it.

Plan for Regicide while you are down here. It sends you back through the pass and across the grid twice more, and your safe grid path stays the same, so write it down the first time.

Requirements and Prerequisites

One skill and one short quest chain. Ranged 25 is boostable, so a ranging potion covers a small shortfall.

Quest prerequisites:

• Biohazard
• Plague City, which Biohazard needs

Recommended rather than required: 60 combat, 50+ Agility so you fail fewer obstacles, 50 Thieving for the maze shortcut, and 43 Prayer for Protect from Melee.

Items to Bring

Two ropes and enough food decide most runs. Anything marked as obtainable during the quest can be picked up on the way.

Required

• Rope (2 recommended)
• Bow
• 1-5 unpoisoned arrows with metal tips
• Spade
• Bucket (obtainable during quest)
• Tinderbox (obtainable during quest)

Recommended

• Plank (obtainable during quest)
• Combat 60
• Agility 50+ to reduce the risk of failing obstacles.
• Thieving 50 for a helpful shortcut.
• Weapon or combat spells. Using the bow is recommended if you need to save inventory space.
• Armour or Prayer 43 for Protect from Melee.
• Summer pies if you are under 60 Agility (22 healing over two bites, +5 Agility per bite); otherwise brews and restores to save weight.
• Coins for Kamen's 75-coin meal in the dwarf camp, which heals 28 in total.
• Bones to peaches tablets, since the weak monsters down there drop bones.
• West Ardougne Teleport to quickly access the Underground Pass (dungeon) entrance.
• Level 79 combat will make Blessed spiders non-aggressive, which saves some time while killing Kalrag.
• An explorer's ring and stamina or energy potions
• 2+ Agility potions if not taking summer pies (for players with a low Agility level).
• Telekinetic Grab runes for the Amulet of othanian
• Any instant teleportation method if you need to leave the dungeon

Where to Start and How to Get There

Starting location: King Lathas, 1st floor of Ardougne Castle in East Ardougne (2nd floor US).

The pass itself is a cave at the far west end of West Ardougne. Walk west through the city until you reach it; Koftik stands outside the entrance.

The quickest spell route is West Ardougne Teleport on the Arceuus spellbook (61 Magic, 2 law and 2 soul runes, needs Biohazard), or its teleport tablet. After the quest the same tunnel is one of the ways through to Tirannwn, which is how Regicide uses it.

Walkthrough, Stage by Stage

Steps follow the OSRS Wiki quick guide order. Dialogue choices that matter are listed in brackets. Pack everything before you enter the cave: once you are past the bridge there is no turning back without restarting the dungeon.

1. 1

   Starting out.

   Speak with King Lathas on the 1st floor of Ardougne Castle (2nd floor US). (dialogue: I am. What's our plan? → Yes.)

2. 2

   Speak with Koftik in the westernmost part of West Ardougne next to the cave.

   (dialogue: I'll take my chances.)

3. 3

   Enter the cave and run south at the first junction.

4. 4

   Speak with Koftik for a cloth.

   Use it on an arrow, then use your tinderbox on it or use the arrow on the fire on the ground.

5. 5

   Go north to the gated area.

6. 6

   Before shooting the rope, pick up anything you dropped.

   Once the bridge is down you cannot get back to those items unless you pull the lever to go back across. Items dropped close to the bridge can be telegrabbed.

7. 7

   Equip your bow and lit fire arrow (light it with your tinderbox), then shoot the guide rope attached to the bridge. After crossing, do not take the middle path and do not pull the lever right after the bridge, which sends you back to the beginning.

8. 8

   Once across the bridge, take the plank in the north room (if you did not bring one).

9. 9

   Continue through the cave until you reach a section with water and a pit.

   Ignore the water, use a rope on the rock above the pit. If you fail, you will lose your rope.

10. 10

    Continue through the cave until you reach a large grid.

11. 11

    Walk across the grid and use trial and error to find your path.

    You will fall through some of the tiles.

12. 12

    Keep your Hitpoints above 15 while crossing the grid.

    Each fall deals 15 damage, and the safe path is permanent for your account, so note it for Regicide.

13. 13

    Pull the lever next to the gate.

14. 14

    Orbs of light.

    You can now pray Rapid Heal for the duration of this step (there is an altar up ahead). Run west past the zombie camp, there will be five sets of odd markings along the walls of the corridor (You must attempt to disable the wall traps or walk past them).

15. 15

    Grab the plank by the furnace if you did not grab one earlier.

16. 16

    You will reach an altar, take the north path using the plank on the flat rocks.

17. 17

    Take the orb and walk back to the altar.

18. 18

    Take the north-west path with the ogres and blessed spiders.

    Take the orb.

19. 19

    Take the centre-most west path, traversing the flat rocks using the plank.

    Take the orb.

20. 20

    On the last path, do not pick the orb up directly.

    Search the rock beneath it, disarm the trap, then take the orb.

21. 21

    Return east to the zombie camp and use all four orbs on the furnace.

    Go back to the altar, turn off your prayers and climb down the well.

22. 22

    Picklock the south-east slave cage, dig the loose mud with your spade and cross the ledge to the west. With 50 Thieving, take the shortcut and avoid the bubbles; without it, cross the stone bridge maze. Squeeze through the pipe.

23. 23

    Search the unicorn cage, walk the path south of it and use the piece of railing on the boulder above the unicorn. Search the cage again for the unicorn horn.

24. 24

    Kill the three paladins, Sir Jerro, Sir Carl and Sir Harry (level 62, melee), for their badges.

    They can be safespotted from the hallway to the south.

25. 25

    Use a plank on the flat rock, use the three badges and the unicorn horn on the well, then open the door.

26. 26

    Go down into the dwarf camp.

    Talk to Niloof for free food and to Klank, keeping a slot free for Klank's gauntlets. Kamen sells a 75-coin meal that heals 28 in total. Turn down his homemade brew, which drains 4 Agility.

27. 27

    Cross the broken bridge north-east of Kardia's house to pick up her cat, use the cat on her door, then open the chest inside with 4 free inventory slots. Do not skip the chat option.

28. 28

    Kill Doomion, Othainian and Holthion (level 91 each) west of Kardia's house and take their amulets, then open the chest north of the middle demon.

29. 29

    Fill a bucket at the brew barrel in the eastern dwarf house, then use the dwarf brew and a tinderbox on Iban's tomb in the south-east corner of the lower level.

30. 30

    Drop the bucket and tinderbox, run north to the spider pit, kill Kalrag (level 89) and leave straight away. The blessed spiders around her are aggressive below 79 combat.

31. 31

    Go north-west and up through the cave entrance to the half-soulless area.

    Wear Klank's gauntlets and search the cage on the dead-end platform in the north for Iban's dove. It goes straight onto the doll, not into your inventory.

32. 32

    Confronting Iban.

    Go back south to the broken bridge you crossed, then east and south to the disciples of Iban.

33. 33

    Defeat a disciple of Iban in the middle of the maze and pick up his robes.

34. 34

    Wear the robes.

    You only need them on to get through Iban's doors.

35. 35

    Do not drop anything you want to keep.

    Using the doll on the well teleports you to the entrance of the tunnels.

36. 36

    Enter the temple.

    While Iban talks, step one tile north of the well, then right-click Use the doll on the well (not Investigate).

37. 37

    Iban can deal a lot of damage quickly, so go in with full hitpoints and a few pieces of food.

38. 38

    Iban's spikes deal around 5 to 8 damage each and cannot be blocked with prayers.

    Running directly to the well should be fairly easy with one or two food items.

39. 39

    Use the Doll of Iban on the well in the centre of the room.

    You may have to do this a few times, as his attacks may interrupt you. When you do manage to get the doll into the well, Iban will be destroyed and the temple will begin to collapse.

40. 40

    Speak to Koftik to be transported back through the pass.

41. 41

    Head back to Ardougne Castle and speak with King Lathas.

42. 42

    Finish the closing dialogue to complete the quest.

Obstacles and Traps

There are no light or mirror puzzles in Underground Pass. What slows people down is a chain of obstacles that cost hitpoints or send you back.

Boss Fights

None of the fights are hard at 60 combat if you use the safespots. The real risk is reaching one already low on food after the traps.

Deaths here follow normal rules, so leave expensive items you do not need in the bank.

Rewards and Unlocks

The XP is small. The reasons to do it are Iban's staff and the route it opens to Regicide and Tirannwn.

What it opens up

• Regicide, and through it Tirannwn, Roving Elves and the rest of the elf series
• Legends' Quest and Freeing Sir Amik Varze
• The medium Ardougne Diary
• Free recharges for Iban's staff at the well in the third area of the dungeon

Fact checked 2026-10-12 against the OSRS Wiki quest page and quick guide.

Common Mistakes and Warnings

These cost the most time.

• Taking the middle path after the bridge. The swamp drags you down a hillside and you have to crawl back up.
• Pulling the lever right after the bridge, which sends you back to the beginning.
• Bringing one rope. A failed swing costs it, so carry two.
• Dropping an item you still need before shooting the bridge rope.
• Reaching Iban short on food after spending it on the grid and the wall traps.
• Skipping Agility boosts under 60 and failing the ledge and obstacles over and over.

Ironman Notes

Summer pies heal 22 over two bites and boost Agility by 5, which is the best help below 60 Agility.

Bones to peaches tablets turn bones from the weak monsters in the dungeon into food, so you can carry fewer cooked fish.

After Iban, Koftik takes you back through the pass, so you do not need a teleport out.

FAQ

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