This quest has a quick guide, found here, which briefly summarises the steps needed to complete the quest.

Contents 1 Official description 2 Walkthrough 2.1 Unattended 2.2 Diary of the.. Presumably Dead 2.3 Elementary 2.4 Preparation 2.4.1 Inventory 2.4.2 Combat 2.5 The Horror 2.6 The God Books 3 Reward 4 Music unlocked 5 Required for completing 6 Transcript 7 Trivia

Official descriptionEdit

“

The lighthouse protecting Kandarin's 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.

”

Walkthrough Edit

Start point:	Speak with Larrissa, who is outside the Lighthouse, north of Barbarian Outpost.
Member requirement:
Official difficulty:	Experienced
Length:	Short (Long if you haven't already done the Bar Crawl miniquest)
Requirements:	Quests: Barcrawl 35 (boostable) Agility 43 is HIGHLY recommended. Ability to defeat a level 100 and level 120 monster, the second one being quite tricky.
Items required:	Items from the toolbelt do not need to be listed unless that version won't work, or aren't automatically added to it. For fixing the bridge: 60 steel nails 2 normal planks (can be obtained during quest, just north of the Barbarian Outpost) For fixing the lighthouse mechanism: Molten glass 1 swamp tar Tinderbox (toolbelt does not work) For activating the wall: 1 Fire rune 1 Water rune 1 Earth rune 1 Air rune A sword of any type that you are willing to lose An arrow of any type (except ogre and training) you are willing to lose Recommended: A melee weapon (Ideally a slash weapon), a ranged weapon (ideally thrown weapons), and runes for all four elemental spells to switch amongst in combat Games Necklace and quick teleport tabs are very helpful to reach the Lighthouse during the quest. Houses by Rellekka are also helpful transportation methods.
Enemies to defeat:	Level 100 Baby Dagannoth Level 120 Dagannoth mother

UnattendedEdit

Travel to the Lighthouse by using an enchanted lyre, a games necklace teleport to Barbarian Outpost, a Teleport to House, if your house is in Relekka, or any other method that you wish. Start the quest by speaking to Larrissa, who can be found standing just outside the lighthouse entrance.

Larrissa tells you that she thinks that her boyfriend, who resides in the lighthouse, has gone missing as she hasn't seen him for a few days. To further her fears, the light is switched off and the front door bolted shut, which she says is unlike him.

Diary of the.. Presumably DeadEdit

When you offer to help search for her boyfriend, Larrissa suggests you speak to Gunnjorn at the Barbarian Outpost for a spare key to the lighthouse and also fix the broken bridge to the east.

To be able to enter the agility area and talk to Gunnjorn, you must have completed the miniquest Bar Crawl.

• Travel to the outpost by either using a games necklace teleport or by going south, across the basalt platforms. Talk to Gunnjorn at the start of the agility course and get the lighthouse key; you can get two planks here; they respawn just north of the outpost.
• With a hammer and 60 steel nails in your inventory, use the planks on both sides of the broken bridge located east of Larrissa, shown in the map above. You can cross the broken bridge by doing a small jump, so just hop to the other side and fix that part of the bridge.

Go back and talk to Larrissa again, who now tells you to enter the lighthouse and search for Jossik. Inside the lighthouse, climb to the first floor and search the bookcase. Take all the books available and flip through the lighthouse manual, ancient diary and Jossik's diary, which tells you about the history of the lighthouse and its inhabitants.

• On the top level, use molten glass, swamp tar (not swamp paste) and a tinderbox on the lighting mechanism. The lighthouse will now be fixed.

ElementaryEdit

Go down to the basement of the lighthouse, where you will find a small cavern with a strange wall, having six empty slots fitted into its frame.

• Use all of the basic elemental runes on the wall, (fire, water, earth, and air)
• Use your sword and your arrow (any type, but remember that you will not get them back).

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Warning: This is your last chance to prepare for the fight.

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PreparationEdit

If you haven't prepared for this fight with armour and runes for casting magic, teleport to any place with a bank to ready yourself. If you only brought a games necklace, then use it to teleport to the Gamers Grotto or Burthorpe Troll Invasion and bank there. While you are there, pick up any quick teletab to any city or your POH, just in case you are close to death, to save yourself.

InventoryEdit

• Get good armour (Rune or better), Dragon hide armour, or mage armour (Mystic or better), bring many combat runes to cast several of each elemental spell. (wind, water, earth, and fire), get a good weapon for melee, and some ranged equipment. If possible, equip a ring of life and bring a one-click teleport just in case things get messy.
• Stock with prayer potions and a super set.

CombatEdit

If you cannot see the colour changes very well, look to the chat box. There would be a message "The Dagannoth mother turns (colour)..." Also, you can change the graphics to "safe mode" to brighten the scene, allowing you to see her colour clearly. Using the wrong type of attack incurs splash damage.

• By default, her first form is always white. The cycle of the colour changes of the Dagannoth mother seems to be totally random.
• She can detect prayer and will automatically switch to an attack type different to your protection prayer. By default, she ranges at a distance and melees up close. She can hit up to 160 with melee and accurate, double-120s with ranged, so Protect from Missiles/Deflect Missiles is recommended.
• If you stop attacking her at any point or take too long to finish her off, there is a possibility that she will disappear and you will have to start the fight again.
• If a player has reasonable defence, they could consider using attack-boosting prayers instead, because the Dagannoth mother has a rather poor accuracy.
• If you plan on only using 1 attack type, you can safespot until the mother changes to the colour you want. For her to change colour, you have to move to a spot where she can attack you, although you can quickly go back to the safespot to prevent damage. This is one of the easiest methods of defeating her, using little food and minimal ammunition.

Get ready to face the mother!

The HorrorEdit

Once you are ready, walk through the unlocked wall and down the ladder. You find Jossik alive, but hurt and resting against the dungeon wall. He tells you that his search for his lost uncle, Silas, had bought him past the secret door, but he was attacked by a monster who was able to trap him there.

As he is talking, he announces that the monster is coming back. A cutscene plays where a dagannoth appears from the water. The monster can be fairly easily disposed; put on protect from melee and range or melee it, as you need to save your runes for its mother.

After you defeat it, try to help Jossik up to the surface, but he tells you that that wasn't the monster that had attacked him. A cutscene will show the Dagannoth mother emerging into the cavern, and engaging you immediately into battle.

Colour	Attack Weakness
White	Air spells (Wind Strike, Bolt, Blast, Wave, and Surge)
Blue	Water spells (Water Strike, Bolt, Blast, Wave, and Surge)
Brown	Earth spells (Earth Strike, Bolt, Blast, Wave, and Surge)
Red	Fire spells (Fire Strike, Bolt, Blast, Wave, and Surge)
Orange	Melee attacks (Slash > Stab/Crush)
Green	Ranged attacks (Thrown > Arrow/Bolt)

The God BooksEdit

After you defeat the Dagannoth mother, Congratulations. You have survived the Horror from the Deep!...once.

As a reward from the Dagannoth mother, you obtain a rusty casket. Go to the first floor of the lighthouse and show it to Jossik. If you had a full inventory when defeating the Dagannoth mother, you will not receive a rusty casket. Instead, you must talk to Jossik, who will have picked it up for you.

You may now choose a book affiliated with the three gods: a Holy book (Saradomin), an Unholy book (Zamorak), or a Book of Balance (Guthix). A Holy book gives +8 to all defensive equipment stats, an Unholy book gives +8 to all offensive equipment stats, and a Book of Balance gives +4 to both.

RewardEdit

• 2 quest points
• 4,662 Experience
• 4,662 Experience
• 4,662 Experience
• 2 extra spins on the Squeal of Fortune
• A God book of your choice
• Access to the lighthouse general store and the Dagannoth caves underneath (There are level 74 and 92 Dagannoths. The level 74's use a ranged attack that has terrible aim, and the level 92's use their much more effective melee attack)

Music unlockedEdit

• Out of the Deep
• Lighthouse

Required for completingEdit

Completion of Horror from the Deep is required for the following:

• Blood Runs Deep
• Recipe for Disaster/Defeating the Culinaromancer

TranscriptEdit

This article on a quest has an associated dialogue page. Click here for a transcript of possible conversations encountered throughout the quest.

TriviaEdit

• The quest was originally named Lighthouse Quest.
• Upon the completion of this quest, one's Adventurer's Log will read: "A foul and horrible creature dwelt below the lighthouse. I have slain it, but the lighthouse keeper, Silas, remains missing."
• The lighthouse user's manual mentions a service centre advertised in the Varrock Herald. However, there is no such advertisement in the Herald.
• It is impossible to obtain a book of Armadyl, Bandos, or Zaros as a reward for the quest. You can only choose to buy those books after you obtain and complete the three books of Guthix, Saradomin and Zamorak.
• The name of one of the unlocked music tracks, out of the deep, may be a reference to "Out of the Blue" by Debbie Gibson, a popular late 1980's teen pop star.
• The name of the quest may be a reference to H.P. Lovecraft and the X-Com game "Terror from the Deep".
• If you leave the mother Dagannoth alone and talk to Jossik again, a second one will come out of the water. It will most likely just wander around aimlessly until you kill the original one and finish the quest. 
• When you complete the quest, the scroll says: 'Congratulations! You have survived the Horror From The Deep!' This is one of the only quests that say something different to having completed a quest, along with My Arm's Big Adventure and One Small Favour.

v • d • e Fremennik quest series
Main series	1. The Fremennik Trials 2. Throne of Miscellania 3. Royal Trouble 4. The Fremennik Isles 5. Mountain Daughter 6. Lunar Diplomacy 7. Dream Mentor 8. Glorious Memories 9. Blood Runs Deep
Related quests	The Tale of the Muspah • Horror from the Deep • Olaf's Quest • Gunnar's Ground
Related miniquests	Koschei's Troubles