ok,here's how you can beat it.-->




this quest guide was written from malitic.thanks to fireball026,king-ownage,
xion the one, Weezyrowe, Aakanaar, Monkeymatt, Slow Cheetah, greywolf, MuH-K0o0o, Randuh, Kang227, Moon Myth, Spacepopscle, Nightwing767,Sheep01, kyse, Mistmantle, danielson666, halk 5, I Play Rs, and LogGamer for corrections.
This quest guide was entered into the RuneHQ database on Wed, Nov 17, 2004, at 04:48:50 PM by Weezrowe and was last updated on Thu, Oct 04, 2007, at 10:18:56 AM by LogGamer.
If anything is incorrect/missing from this quest or you have new information to submit about this quest, use this link: Submit record # 00432 - Horror From The Deep updates/feedback
Description: The lighthouse protecting Kandarins North Western coastline has mysteriously stopped operating, and contact with the lighthouse keeper Jossik has been lost.

The Council would greatly appreciate it if somebody could discover for them what has happened to this most vital landscape feature.
Difficulty: Experienced
Length: Short
Requirements: Level 35 agility
Be able to defeat a tough level 100 monster(two level 100 monsters, with the second one being rather difficult if you are a lower level, I was level 82 and had a tough time with him - MrStormy)
Level 13 and higher magic is an advantage
Must have completed the Barcrawl MiniQuest
Items Needed: 1 Molten glass, Tinder box, 1 of each: Air, Water, Fire, and Earth rune (NOTE:Combo runes do NOT work.), 60 Steel nails, 2 Planks (can be gotten from near Barbarian Outpost), 1 Swamp tar (not paste, get the tar from Lumbridge Swamp), Hammer, 1 arrow (any kind, except ogre type), and 1 sword (any kind but you will not get it back, so use Steel or below)
Quest Points Reward: 2
Reward: A Damaged prayer book of your choice; 4662 Range, Magic and Strength experience
Start Point: The Lighthouse North of the Barbarian Outpost
To Start: Speak to Larrissa Instructions: Part 1: Fix the Lighthouse

1. Go to the Lighthouse area (located in the farthest northwest corner of Runescape) and talk to Larissa.
   
   
2. Go down south of her across the jumping platforms and into the Barbarian Outpost to talk to Gunnjorn and get the Lighthouse key. Or you may jump the broken bridge. (If you don't already have Planks, get them here.)
   
   
3. Use the two Planks on the broken bridge east of Larissa (automatically uses your Hammer and Steel nails).
   
   
4. Go back and talk to Larissa. After talking to her go into the Lighthouse.
   
   
5. Go up one level and search the book case; take the books. Read the lighthouse manual and the diary.
   
   
6. Go up one more level. Use the Swamp tar with the lighting mechanism and then use your Tinderbox on it. Then use your Molten glass on the lighting mechanism.
   
   
   
   
7. Go back down and talk to Larissa.
   
   

Part 2: The Door

1. Have the runes, arrow, and the sword in your inventory and go down the ladder and walk over to the strange wall.
   
   
2. Use your arrow, sword, air rune, earth rune, water rune, and fire rune on the strange wall.
   
   Note: You will not get any of this stuff back.
   
   
3. Open the strange wall, climb down the ladder, and talk to Jossik.
   
   

Part 3: The Monster from the Greyish-Green Lagoon

1. After the first baby is killed another level 100 monster attacks you.
   
   
   
   It uses a form of the prayers and changes colors to show what it is weak to:
   
   
   • Orange means you can melee.
   • Green means you can range.
   • Red means you can use fire spells.
   • Brown means you can use earth spells.
   • Blue means you can use water spells.
   • White means you can use air spells.
   
   
   If you need help on colors they show up in the chat box.
   
   It also attacks with both range and melee attacks, the range attack is weak so always use protect from melee.
   
   
2. Switch between melee, range and magic as the monster switches colors. Just keep your prayer up and keep an eye on your hits. Some people recommend hiding behind the nearby rocks as it changes to forms you can't attack, then rushing back out to continue the battle.
   
   

Part 4: Quest End

1. Quest finished! When you kill the second monster you will be automatically transported out of the room and you will see the Quest Completed picture. You will get your exp, quest points and a Rusted coffin.
   
   
2. Go up to the second story of the Lighthouse; Jossik is now there. You can buy most ales and some other stuff off him. But for now talk to him. He tells you to read what the Rusted coffin says; pick the same god twice to receive a Damaged book of that god (Guthix, Saradomin or Zamorak).