|Main music||Hunting Dragons|
|Strongest monster||Queen Black Dragon (level 900)|
|Quests||Song from the Depths|
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The Grotworm Lair is located in the caves north-west of the Port Sarim lodestone. The lair has three levels, containing creatures of levels 28, 63 and 98 respectively. They are assigned by slayer masters. Many special drops can be found here, such as bolts for the Coral crossbow and Royal dragonhide. The Queen Black Dragon also resides here.
For players wishing to kill the Queen Black Dragon or mature grotworms, there is a slide shortcut down to the bottom level of the Lair, requiring 50 Agility. For players wishing to swim through the acid in the entrance, 50 Constitution is required.
Players cannot set up cannons here. Attempting to do so will generate a game message saying "The air here is too damp for the cannon to be set."
The White Knights sent Sir Rebrum to investigate the Lair, but the cautious Rebrum is more than happy for the player to venture in on their own, after his last attempt to explore the caves resulted in the deaths of most of his subordinates.
If you die inside the Grotworm Lair, your gravestone will appear outside.
- Young grotworm (Level 28)
- Grotworm (Level 63)
- Mature grotworm (Level 98)
- Queen Black Dragon (Level 900)
White knight corpsesEdit
There are several corpses of white knights involved in the charge through the cave by Sir Rebrum. Here are their names. Like most White Knights, their names are a pun on a certain word. Every corpse is found on the first floor. Even though these white knights are highly trained warriors, they all seem to be very weak. They die in the area inhabited by low level monsters and some even have corpses where the monsters don't even go. Their names are as follows:
- Sir Vey (survey)
- Sir Rinch (syringe)
- Sir Loynst Ayke (Sirloin steak)
- Sir Rial (surreal)
- Sir Pent (serpent)
- Sir Remony (ceremony)
- Sir Rillic (Cyrillic)
- Sir Rownd (surround)
- Sir Rogate (surrogate)
- Sir Render (surrender)
- Sir Ruppe (syrup, has a silent pe in his name)
- The grotworms are parasites that have been eating the Queen Black Dragon from the inside out; this explains why they drop royal dragonhide.
- In the deepest level of the Grotworm Lair, there appears to be an image of the Dragonkin symbol. Underneath it is a set of spiral stairs leading further down, which was inaccessible until the release of Hero's Welcome quest. During the quest the player finds out that the stairs, now unlocked by Tarshak, lead to the hidden laboratory of Dactyl Dragonkin Phalaks. The location can be visited after the quest, although its inhabitant is no longer present. Also, most of the rooms are inaccessible due to the chasm that surrounds the main chamber.