Horror from the Deep

This quest has a quick guide. It briefly summarises the steps needed to complete the quest.

Horror from the Deep is an intermediate quest revolving around the mysterious disappearance of Jossik, keeper of the Lighthouse near the Fremennik Province. As the title suggests, the investigations lead to the discovery of very dangerous creatures living beneath the lighthouse.

Start point	Talk to Larrissa outside the Lighthouse north of Barbarian Outpost. Show on map
Official difficulty	Intermediate
Official length	Short
Description	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.
Requirements	35 Agility [boostable] [not required to start] Completion of Alfred Grimhand's Barcrawl [required to start]
Items required	Fire rune Air rune Water rune Earth rune Any sword or longsword that you are willing to lose (except rusty sword and prop sword) Any arrow (except ogre arrows and training arrows) Molten glass Tinderbox Hammer 60 steel nails 2 regular planks (can be obtained from Barbarian Outpost) Swamp tar At least one combat style to defeat the Dagannoth Mother - she cycles every 18 seconds between only being vulnerable to one of six different types of attack Highly recommended to bring means to deal damage with all of the elemental Magic types (air, water, earth, and fire spells) You may also bring means to deal Ranged and Melee damage (she has high resistance to melee)
Recommended	40 Prayer for Protect from Missiles against the Dagannoth Mother's ranged attacks 50 Combat level Armour and some food 13 Magic+ to cast each elemental spell Fast travel to several locations Lighthouse to start the quest plus one additional trip - fairy ring ALP, games necklace to Barbarian Outpost or Minigame Teleport to Barbarian Assault Barbarian Outpost (1 trip) - games necklace or Minigame Teleport to Barbarian Assault
Enemies to defeat	Dagannoth (Horror from the Deep) (level 100) (can be completely safespotted) Dagannoth Mother (level 100) (with use of a safespot and Protect from Missiles, all damage can be negated)
League notes	Unlocking Fremennik✓ will auto-complete the quest

Items needed: 60 steel nails, a hammer, and 2 planks
Items recommended: Fast travel method to the Barbarian Outpost and back
Skills needed: 35 ^[boostable] to enter the pipe inside the agility course

Head to the Lighthouse, located north of Barbarian Outpost, reachable via the basalt platforms. If travelling from the outpost, you can obtain the required planks from the north-east end along the fence. Bring food as the platforms have a high failure rate even with decent agility, and a max hit of 10. Alternatively, fairy ring ALP will take you right by the lighthouse.

Speak to Larrissa, who will tell the player that her boyfriend lives in the lighthouse. She is worried about him, as the light has gone out and the door is now mysteriously locked. Ask how you can help; she is stranded here, as a storm destroyed the bridge to the east, and she wants you to repair it. She also requests you retrieve a spare key to the lighthouse from her cousin at the Barbarian Outpost.

Some distance east of Larrissa is a broken bridge that connects to the mainland. With a hammer and 60 steel nails in your inventory, use a plank on the side of the bridge you are on, then click to jump to the other side to use a plank there as well. Depending on your agility level, you may take slight damage from the leap. Once the bridge is fixed, you will be able to cross without failure, despite the bridge not looking any different.

Check your quest log to make sure it says that you've fixed the bridge, then head to the Barbarian Outpost. Speak to Gunnjorn, found inside the Agility course, through the pipe ( 35 ). Tell him Larrissa is in trouble and needs her spare key back, and he will give you the lighthouse key.

Return to Larrissa. She asks you to go inside the lighthouse and find out what happened to Jossik. Enter the building; you will appear in an instance with Larrissa inside. The furniture is smashed and there are blood splatters and claw marks on the floor and walls. She asks you to repair the light mechanism to prevent any shipwrecks. She does not know how to, but says Jossik probably had some manuals lying around.

By searching the bookcase on the 1^st floor, you may find the lighthouse manual, Jossik's journal, and his uncle's diary. Reading these is not required to progress the quest. If you choose to read them, the manual will describe how to maintain the Lightomatic Deluxe 500, with a troubleshooting FAQ section at the end of the book. The journal describes how Jossik became the lighthouse keeper after his uncle disappeared, and soon began to hear voices. It ends with Jossik's decision to investigate the strange noises coming from the basement. In his diary Silas discusses the monstrous dagannoth in-between incoherent ramblings, as well as his construction of a metal door in the basement. He mentions that to unlock the door, 'the key' is fire, air, water, and earth runes, as well as weapons.

Head to the 2^nd floor and use some molten glass and swamp tar on the lighting mechanism in order to fix it, then light the tar with a tinderbox. Return to Larrissa, who requests that you do everything to find Jossik.

Go down the iron ladder into the basement to find the door mentioned in Jossik's journal. You appear in a kind of sea cavern, with further passage blocked by the metal door. It has a monstrous face in its centre surrounded by six icons: the four runes, a sword and an arrow.

Use all of your basic elemental runes on the door (fire, water, earth, and air). You may bring a full stack of each, as the door will only use one rune. Use your sword on the door (any type), and then an arrow (any type except ogre and training). Bolts will not work. You do not get these back!

Once you have used all of the items on the door, it will unlock. Ensure you have your combat equipment with you, and go through the eastern part of the door and down the ladder. Be prepared to fight both a dagannoth and the dagannoth mother, then talk to Jossik sitting injured by the ladder, who says he was trapped down here by creatures that attacked him. When the player suggests they should return upstairs to find help, a level 100 dagannoth emerges from the sea and attacks!

The dagannoth only attacks with melee and can be killed with any combat style. You can utilise a safespot by standing in the southern corner of the pond to the west.

After defeating it, Jossik says that was not the creature that had attacked him but one of its babies. A cutscene follows in which a larger dagannoth appears from the waters, revealing itself to be the much stronger dagannoth mother. She attacks with both ranged and melee, and changes colour every 18 seconds through a fixed cycle, indicated through a chat message The Dagannoth changes to blue... as well as visually. Her six colours correspond to the four elemental spell types, ranged, and melee. For as long as she remains that colour, she can only be damaged through use of that particular attack style.

Image	Colour	Weakness	Attack Using
	White	Air spells	Wind Strike, Bolt, Blast, Wave, or Surge.
	Blue	Water spells	Water Strike, Bolt, Blast, Wave, or Surge.
	Orange	Melee	Melee attacks.
	Brown	Earth spells	Earth Strike, Bolt, Blast, Wave, or Surge.
	Red	Fire spells	Fire Strike, Bolt, Blast, Wave, or Surge.
	Green	Ranged	Ranged attacks.

The same safespot used for the regular dagannoth is not as effective here, as she may eventually attack you. You can use the stalagmites in the south-east corner of the room to flinch with a melee weapon, using Protect from Missiles to avoid her ranged attack when using the other combat styles. By default, the mother will use ranged at a distance and melee up close, but may detect Prayer changes and automatically use the opposite attack type.

You can defeat the Dagannoth mother without using all of the combat styles, and may choose to simply wait in a safespot (or up the ladder) while she is the wrong colour. You could also use these pauses to heal. As she has a weakness to earth, this is the most effective source of damage. Magic and Ranged is equally effective, but she has a higher resistance to melee.

Note: The Twinflame staff is not recommended, as it will remain on Earth spells as the mother's weakness, even if she has changed colour.

Warning: Any dropped items will be unobtainable after defeating the boss. You may still loot your items if you die before killing her.

Defeating the Dagannoth mother will automatically complete the quest, and you will receive a rusty casket. The casket can be obtained from Jossik upstairs if you had a full inventory.

Congratulations, quest complete!

• 2 Quest points
• 4,662.5 Magic experience
• 4,662.5 Strength experience
• 4,662.5 Ranged experience
• A damaged book of your choice which, when complete, will become: a Holy book (Saradomin), an Unholy book (Zamorak), or a Book of balance (Guthix).
  • Further damaged books can be purchased from Jossik for 5,000 coins each, even if you have not filled your other book(s).
• Access to the Lighthouse general store and the Dagannoth caves underneath.

Unlocks:

• Dagannoth mother accessible in the Nightmare Zone.

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

• Recipe for Disaster - Defeating the Culinaromancer
• Rag and Bone Man II (The Fremennik Trials can be completed as an alternative prerequisite)
• Medium Fremennik Diary

• While in instanced versions of the lighthouse, you no longer see the fairy ring outside which was added later.
• The location, characters, books, diaries, monsters, are paying an obvious tribute to the works of H. P. Lovecraft.
• Despite being somewhat repaired during the quest, the broken bridge's examine will still refer to jumping off it rather than crossing it on the walkway.
• In Silas's diary, the colours white, blue, brown and red refer to the elemental runes needed for the door, while yellow and green refers to the sword of the warrior and the arrow of the huntsman, respectively.
• Unlike most quests, the reward scroll for this quest congratulates you on "surviving" the quest, rather than completing it.