Horror From The Deep
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Requirements

  • 35 Agility
  • 40 Prayer (optional, but strongly recommended)
  • Ability to defeat level 100 Dagannoths (can be safespotted, but you will have to take a few ranged hits - Dagannoth Mother can hit for 24 in ranged)
  • Completion of Alfred Grimhand's Barcrawl miniquest

Items

  • 1 Fire rune
  • 1 Water rune
  • 1 Air rune
  • 1 Earth rune
  • 1 Sword of any type (will be lost)
  • 1 Arrow of any type (will be lost)
  • 1 Molten glass
  • 1 Tinderbox
  • 1 Hammer
  • 60 Steel Nails
  • 2 Planks (obtainable during quest)
  • 1 Swamp Tar
  • Combat gear (Magic recommended)
  • Food (recommended)
  • Games necklace (recommended)

Walkthrough

Speak to Larissa outside the Lighthouse to the north of the Barbarian Outpost to start the quest.

Fixing the Lighthouse

  1. After speaking to Larrisa go down south of her jumping across the basalt platforms and into the Barbarian Outpost.
  2. Talk to Gunnjorn (in the Barbarian Outpost Agility arena) and get the lighthouse key; you can get your two planks here, which respawn north east of Barbarian's Outpost.
  3. Use both planks on the broken bridge east of Larrissa.
  4. Go and talk to Larrissa again.
  5. Go up to the first floor. Search the bookcase and take all the books, flip through the lighthouse manual and the Ancient diary.
  6. Go up one more floor, use the following items on lighting mechanism in this order: swamp tar, molten glass, tinderbox.

Unlocking the Basement Door

Very simple

  • Go down the iron ladder into the basement to find the door and then use all of your basic elemental runes on the door (fire, water, earth, and air).
  • Use a sword on the door (any type, but you will not get it back) and an arrow on the door (any type, but you will not get it back).

The Fight

You will want to prep for a fight now. If you don't already have your food and gear, find a bank and teleport back (preferably with the games necklace to Barbarian Outpost)

The main Boss is the Dagannoth Mother, she has high defense vs melee and ranged but low magical defense and can be safespotted. You want anything that boosts your magical damage, so bring your best mage gear, an air staff, stacks of each of the elemental runes, and the highest tier of catalytic runes (mind/chaos/death/blood) that you can spare.

Once ready, go through the eastern part of the basement door and go down the ladder.
Talk to Jossik and be prepared to fight two Dagannoths.

  • The first enemy is a Dagannoth that only attacks with melee, easily defeated with Protect from Melee. If you don't have Protect from Melee and your combat level is relatively low you can use the rocks near the back of the room to safespot it.
  • As soon as the first Dagannoth is dead you'll see a cutscene, the Dagannoth mother will then attack you.

Her gimmick is that she can only be damaged by certain attacks depending on her color, and she will cycle colors after several seconds. See the table below:

Color Weakness
White Air magic
Blue Water magic
Orange Melee attacks
Brown Earth magic
Red Fire magic
Green Ranged attacks
  • If you cannot see the color changes very well, look at the chat box. Using the wrong attack does no damage to it.
  • You can safespot her by using the stalagmites in the room. If you do it right, you can get the mother stuck behind a stalagmite where you can stand behind and not lose any health points.
  • The best way to defeat her is to ignore the ranged and melee forms, since her defence against those attack types is too high to be worthwhile. Either use an air staff and switch spell types, or switch your staves if you're quick and want to save up on elemental runes.
  • She can detect Prayer, and will automatically use the opposite attack type when you use prayer. By default, she ranges at a distance and melees up close. She can maul you for 24 damage so beware!

Getting your Reward

After you defeat the Dagannoth Mother you should have a Rusty casket in your inventory. Go to the second floor of the lighthouse and show it to Jossik to finish the quest!
Note: If your inventory is full when killing the Dagannoth Mother you will not receive the casket. Instead go and talk to Jossik upstairs who will say he picked up the casket after you left it on the ground.

Rewards

  • 2 Quest Points
  • 10,489.5 Strength XP
  • 10,489.5 Magic XP
  • 10,489.5 Ranged XP
  • Access to the caves below the Lighthouse (contain level 74 and level 92 Dagganoths)
  • A damaged prayer book of your choice: Holy book (Saradomin), Unholy book (Zamarak), and Book of balance (Guthix). The other two books can be purchased from Jossik for 100,000 coins. All three give the same prayer bonus (+5) but slightly different offensive and defensive bonuses
    • Holy book gives a +8 bonus to all defensive stats, but no offensive bonuses
    • Unholy book give a +8 bonus to all offensive stats, but no defensive bonuses
    • Book of balance gives a +4 bonus to all offensive and defensive stats
    • These books are held in the offhand (shield) slot and only give their bonuses when they are completed. To complete the book, you must use the 'damaged' version with all four pages (found from clues).
    • If you lose your book, you can talk to Jossik to receive a replacement for 100,000 coins.
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