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Horror from the Deep OSRS Quick Guide
Embark on a thrilling adventure with the Horror from the Deep quest in Old School RuneScape (OSRS), a short but exciting intermediate quest that takes you to the mysterious Lighthouse near the Fremennik Province. This guide provides a concise, step-by-step walkthrough to complete the quest efficiently, along with tips to tackle the challenging Dagannoth Mother boss fight. Whether you’re a seasoned player or a newcomer, this SEO-optimized guide will help you navigate the quest and claim your rewards, including access to god books and the Dagannoth caves.
Horror from the Deep revolves around investigating the disappearance of Jossik, the Lighthouse keeper, and uncovering the terrifying creatures lurking beneath. It’s labeled as an intermediate quest with a short duration, making it ideal for players looking to gain quick rewards, including 4,662.5 XP in Magic, Ranged, and Strength.
Quest Requirements
- Skills: 35 Agility (boostable)
- Quests: Completion of Alfred Grimhand’s Barcrawl
- Recommended: Combat level 50+, 13+ Magic, 43+ Prayer for Protect from Missiles
Items Needed
Gather these items before starting to avoid delays:
| Item | Quantity | Notes |
|---|---|---|
| Fire rune | 1 | For strange wall |
| Air rune | 1 | For strange wall |
| Water rune | 1 | For strange wall |
| Earth rune | 1 | For strange wall |
| Sword | 1 | Any except rusty or prop; lost during quest |
| Arrow | 1 | Any except ogre or training; lost during quest |
| Molten glass | 1 | For lighthouse repair |
| Tinderbox | 1 | For lighthouse repair |
| Hammer | 1 | For bridge repair |
| Steel nails | 60 | For bridge repair |
| Planks | 2 | Obtainable at Barbarian Outpost |
| Swamp tar | 1 | For lighthouse repair |
Combat Gear: Bring melee and ranged weapons, runes for air, water, earth, and fire spells (e.g., Wind Strike), food, armor (rune or better), and optionally prayer potions.
Starting the Quest
Begin by traveling to the Lighthouse, located north of the Barbarian Outpost. Use the fairy ring code ALP for instant access or teleport to the Barbarian Outpost via a Games Necklace and hop over the basalt rocks. Be cautious, as the basalt platforms can fail with low Agility, causing damage.
Meeting Larrissa
Speak to Larrissa outside the Lighthouse. She’ll explain that her boyfriend, Jossik, is missing, and the Lighthouse is non-functional with its door bolted shut. Accept her request to investigate (dialogue: 1•1•1•3).
Obtaining the Lighthouse Key
Head south from Larrissa, jumping across the basalt platforms to reach the Barbarian Outpost. Enter the Agility arena and talk to Gunnjorn to receive the Lighthouse key. While here, grab two planks from the spawn northeast of the Outpost if you haven’t brought them.
Repairing the Lighthouse and Bridge
With the key in hand, return to the Lighthouse and unlock the door. You’ll need to fix the Lighthouse’s light and a broken bridge to progress.
Fixing the Bridge
Run east from the Lighthouse to a broken bridge near a crystal tree. Use one plank on each side of the bridge (requires 60 steel nails and a hammer). Jump across the bridge to ensure both sides are repaired.
Investigating the Lighthouse
Go back to the Lighthouse and speak to Larrissa again. Enter the building, climb to the first floor (UK: second floor), and search the northern bookcase twice to obtain a Manual and an Ancient Diary. Read both to proceed. Climb to the second floor (UK: third floor) and use the following items on the lighting mechanism:
- Molten glass
- Swamp tar
- Tinderbox (to light the mechanism)
The Lighthouse is now operational, but the quest is far from over.
Confronting the Dagannoth
Prepare for combat, as you’ll face a level 100 Dagannoth and the formidable Dagannoth Mother. Bank if needed (use a Games Necklace to Barbarian Outpost or a teleport tab). Equip armor, food, and combat gear, including runes for all four elemental spells.
Accessing the Basement
Read the Journal (from the Ancient Diary) to unlock the ability to descend the iron ladder in the Lighthouse’s ground floor. In the basement, approach the strange wall and use the following items on it (items are consumed):
- Fire rune
- Air rune
- Water rune
- Earth rune
- Sword
- Arrow
Open the strange wall, climb down the ladder, and talk to Jossik. A level 100 Dagannoth will spawn.
Defeating the Dagannoth
The first Dagannoth is straightforward. Use Protect from Melee and attack with your preferred combat style (melee or ranged). It can be safespotted behind stalagmites for minimal damage. After defeating it, Jossik reveals this wasn’t the true threat.
Battling the Dagannoth Mother
The Dagannoth Mother (level 100) is the quest’s main challenge. She changes colors, each indicating a specific weakness. Use the correct attack style to deal damage, as she’s highly resistant to incorrect styles.
Dagannoth Mother Weaknesses
| Color | Weakness | Attack Style |
|---|---|---|
| White | Air spells | Magic (e.g., Wind Strike) |
| Blue | Water spells | Magic (e.g., Water Strike) |
| Orange | Melee | Any melee weapon |
| Brown | Earth spells | Magic (e.g., Earth Strike) |
| Red | Fire spells | Magic (e.g., Fire Strike) |
| Green | Ranged | Any bow and arrows |
Combat Strategy
Follow these tips to defeat the Dagannoth Mother efficiently:
- Use Safespots: Hide behind stalagmites or climb the ladder to wait for favorable color changes (e.g., magic or ranged forms, as her melee defense is high).
- Protect from Missiles: Activate this prayer to negate her ranged attacks, which she uses at a distance.
- Switch Spells: Equip an air staff to save runes and quickly switch between elemental spells based on her color. Check the chatbox for color changes if visibility is poor.
- Bring Food: She can hit up to 24 damage, so stock up on high-healing food (e.g., sharks).
- Emergency Teleport: Carry a one-click teleport or a Ring of Life for safety.
Melee and ranged attacks are riskier due to her high defense and time spent switching forms, so prioritize magic. After defeating her, you’ll receive a rusty casket. Note: If your inventory is full, Jossik will hold the casket for you.
Quest Completion and Rewards
Climb to the first floor (UK: second floor) of the Lighthouse and show the rusty casket to Jossik. He’ll offer a damaged god book—choose between:
- Holy Book (Saradomin)
- Unholy Book (Zamorak)
- Book of Balance (Guthix)
Select the same book twice when prompted to confirm. Other books can be purchased from Jossik later for 5,000 coins each. The quest concludes with the message, “You have survived the Horror from the Deep!”
Rewards Summary
- 2 Quest Points
- 4,662.5 XP in Magic, Ranged, and Strength
- Damaged god book of your choice (equipable in shield slot with combat bonuses)
- Access to the Lighthouse general store and Dagannoth caves (levels 77 and 78 Dagannoths)
- Unlocks: Dagannoth Mother in Nightmare Zone and eligibility for Recipe for Disaster (Culinaromancer) and Rag and Bone Man II
Pro Tip: Completing Horror from the Deep is a prerequisite for several other quests and activities, making it a valuable addition to your quest log. The god books, once completed with Treasure Trail pages, offer significant combat bonuses, especially for pures.
With this guide, you’re ready to conquer the horrors beneath the Lighthouse. Grab your gear, prepare your spells, and dive into this Lovecraftian adventure in OSRS!