Waterfall Quest

Walkthrough
The first thing you need to do is take the raft next to Almera's house down the river. Talk to Hudon, then swim away (you'll take a bit of damage).

You should end up near a large building with a fisherman outside of it. This is the tourist information centre. Go upstairs and search the bookcases to find a book about Baxtorian and Garial. Read it to learn that Garial's pebble can be found under Tree Gnome Village, which will give you access to her tomb.

Go southwest of Ardougne to the Tree Gnome Village entrance. You should find a ladder in the hedge maze. Climb down and go west. You will find a gnome called Golrie locked in a room, and you'll need to get the key to free him. Search the crates, avoiding the Hobgoblins until you find a key. Free the gnome to get Garial's pebble.

Now put all of your weapons, armour, and runes in the bank, as you won't be allowed to enter the tomb if you bring them. Go northeast of the tourist centre in Baxtorian Falls to find a tombstone. Use the pebble on it to enter.

Run past the level 84 Moss Giants and search everything until you find Garial's urn and Garial's amulet. Then go back up the ladder and exit.

Make sure you have all of your equipment, 6 air runes, 6 water runes, 6 earth runes, a rope, Garial's urn, and Garial's amulet. Equip the amulet, then go back to Almera's house and board the raft. You will crash again. Use your rope on the various rocks and trees until you reach the front doors of the waterfall. Enter.

Inside, you'll find level 54 Shadow Spiders that drain your prayer, level 86 Fire Giants, and Skeletons. Take the east passage and search the crates for a key. Then take the west passage and go north. You will find six pillars. Use an air rune, a water rune, and an earth rune on each one. Then use your amulet on the statue, and the urn on the chalice. Take the reward from the chalice to finish!

Reward

 * 1 quest point
 * 13750 Attack experience
 * 13750 Strength experience
 * 2 gold bars
 * 2 diamonds
 * 40 Mithril seeds
 * Glarial's Amulet (allows entrance to waterfall in future to kill shadow spiders or Fire Giants)