The Light Within/Quick guide

Starting off

 * Talk to Eluned in the Ithell district.
 * Climb the stairs in the Tower of Voices to attune the enchanted key.

Time-Travelling

 * Teleport to Guthix's shrine after having attuned the enchanted key. (Speak with Lady Trahaearn to reattune if necessary)
 * Rub the enchanted key in front of Guthix
 * Talk to Guthix:
 * Talk option 1: "I am the World Guardian"
 * Talk option 4: "I need to restore Seren"
 * Go west and talk to Haluned
 * Talk option 1: "Yes, we have"
 * Talk option 1: "What are you doing here?"
 * Talk option 2: "Are you related to Eluned"
 * Talk option 3: "[Continue...]"
 * Talk to Guthix:
 * Talk option 2: "[Continue...]"
 * Talk option 2: "Thank you for your help"
 * Return to the Tower of Voices and talk to:
 * Lady Ithell.
 * Arianwyn, read the Baxtorian's journal.
 * Lord Crwys and Lady Meilyr.
 * Lord Amlodd and Lady Hefin.

Artisan shard

 * Equip the Trahaearn Exoskeleton Suit.
 * Investigate the well in Lletya.
 * Answer automaton's questions:
 * "Runite"
 * "Cynog"
 * "Five"
 * "The future is doomed"
 * The automaton will move aside, allowing you to take the shard.

Naturalist shard

 * Speak with Coeden (the living tree) in the Crwys district to obtain a Wintercup mushroom. Click elf clan icons to maintain focus.
 * Gather a Bloodcap mushroom just west of the Tirannwn mushroom farming patch. (southwest of Tirannwn Lodestone)
 * Combine the mushrooms with your Grand defence potion to create an Elixir of Revealment.
 * Travel to the currently active Crystal tree and use the Elixir on any of the Crystal tree shards.
 * Enter the newly appeared entrance and collect the shard.

Military shard

 * Go to Baxtorian falls (bring a Rope and Glarial's amulet).
 * Find the key in the east room then move to the west room and investigate the statue of Baxtorian.
 * Collect the nearby shard.

Wisdom shard

 * Go to the cleansing crystal in the Hefin monastary.
 * Follow lady Hefin as she goes through the poses. If you are struggling remembering the incantation order, note down the first letter as she says them.

Tarddiad

 * Bring the four shards to the Tower of Voices and give each shard to its respective clan leader.
 * Speak to Morvran, go through the door on the west side in to the Grand Library.
 * Go to the shard in the south-western corner, either retrieve or destroy it.
 * Return to the Tower of Voices
 * Teleport to the World Gate with the Sixth-Age circuit. Change the dial so "1" shows on the World Gate, then enter. (It is recommended to bring food, Sharks or higher)
 * Collect 50 Tarddian Crystals by killing Crystal Shapeshifters or collect 150 Crystal Fragments and exchange them with Angof to the north for Tarddian Crystals.
 * Speak to Angof for the final song piece.
 * Return to Tower of Voices.

Freneskae

 * After the cutscene choose if you want to sacrifice Eluned or not.
 * Agree to take Seren to Freneskae.
 * Avoid Muspah attacks by walking around.
 * Talk to Zaros to go to the Elder Halls.

Light Puzzle
There are three rings to the puzzle, outer, middle and core.

Puzzle 1:

 * Outside ring: +2 (2x clockwise)
 * Middle ring: -2 (2x anti-clockwise)
 * Core ring: -1 (1x anti-clockwise)

Puzzle 2:

 * Outside ring: +2 (2x clockwise)
 * Middle ring: +1 (1x clockwise)
 * Core ring: -2 (2x anti-clockwise)

Puzzle 3:

 * Outside ring: 0 (no movement)
 * Middle ring: -2 (2x anti-clockwise)
 * Core ring: -3 (3x anti-clockwise)

Puzzle 4:

 * Outside ring: -2 (2x anti-clockwise)
 * Middle ring: +2 (2x clockwise)
 * Core ring: -2 (2x anti-clockwise)

Seren's return

 * Return to the Tower of Voices.
 * Quest complete!