The entrance is a door on Baxtorian Falls. To get to the door, get on the raft west of Almera's house (west of the Coal Cart Mine). You will crash on a small island. Use a rope with the rock on the small island to the south, you will cross to it. Then use the rope with the Dead Tree on the southern part of this island to lower youself to the door. Be sure you are wearing Glarial's Amulet before opening the door.
Requirements to enter:
Must have completed the Waterfall Quest
Rope
Glarial's Amulet
Recommended items:
Food
Weapon
Armour
Prayer Potions
Features:
Fire Giants in the northern and western rooms (A couple of nice spots for Ranging.)
Quest info:
This area is part of the Waterfall Quest. This is where you finish the quest.
This area is part of the Roving Elves Quest. This is where you plant the Consecration Seed.
Notes:
Shadow Spiders drain your Prayer points when they attack.
The northern doors in the western branch of the dungeon are locked. To open the doors, search the crates in the eastern room to find 'A Key', use it with the doors.