After starting, put on your full mourner clothes and remove all of your other worn items. Bring a Teleport crystal, and some food if you have low Defence or do not have Protect from Melee. Go to the basement of the Mourner HQ in Ardougne and talk to the Head Mourner.
He will give you a new key to the nearby tunnels that they dug to the Temple of Light. He will ask you to find the digging team, a group of slaves and Mourners that have high enough slayer skills to defeat the beasts in the area. Go into the tunnel. You will see level 182 Dark beasts. They require level 90 slayer to kill, can hit up to 17 with melee and up to 8 with magic, and aggressively guard a rune rock. They can be killed for a Death Talisman drop that will be used later in the quest. Run past them (to the West, then take the southwestern turn) to reach the temple entrance. They hit hard, it would be a good idea to use Protect from Melee whilst running past. You'll see a cutscene, shortly thereafter you may be attacked by level 74 Shadows. Search the corpses of the digging team to get a diary and a colour wheel. The wheel is unnecessary for the quest. Read the diary.
The broken, blackened crystals.
Teleport to Lletya and return to Arianwyn to learn about a blackened crystal in the Temple of Light. Bring a chisel and some food, again, if you don't have Protect from Melee, as well as a Teleport Crystal. Go back to where you found the digging team. You'll see level 74 Shadows all over the place. They only have 15 Hp, but they can hit very accurately with melee, are hard to hit, and have a max hit of 13. They're very annoying, so it would be a good idea to protect from melee. To get to the black crystal, from the entrance of the temple, go west. Climb up the stairs. Then go west and as far south as you can go. Go up the ladder. Then go north, west a bit, north again and down the stairs. Go up the next set of stairs and walk east, then south to the crystal. Use a chisel on it to break off a piece. Teleport to Lletya and go back to Arianwyn.
He will summon Eluned, who will enchant the black crystal in your inventory. It will be used at the end of the quest. Talk to Arianwyn again, then you will need to prepare for a long and potentially frustrating puzzle. If you want to attempt the puzzle in one trip, bring the crystal with you, a rope, and leave 10-15 inventory spaces free as the mourner clothing, crystals, and mirrors will leave you strained for inventory space. The mirrors and crystals will be in the same positions you've left them if you decide to teleport out. However, you cannot bank the mirrors and crystals received in the temple, so prepare to at least do the puzzle from the beginning to the end before doing anything else. It is highly recommended to bring some of the following: Prayer boosting equipment, super energy potions, weight-reducing gear, prayer potions, and food. If you find that prayer potions are too expensive, bring good armour and defense potions instead. It is much, much more convenient to buy a Death Talisman (for a considerable price) from another player, and to bring it if you have one. Otherwise you will have to give an NPC a long list of items (see below) to get a Death Talisman. The Death Talisman is not consumed during the quest, and you can either keep it or sell it.
Blue door
Go back to the Temple of Light. Go up the stairs, then go east to the crystal collector. Pull the lever and collect the items inside. You'll get a yellow crystal and 4 mirrors. You need to unlock the blue door with a yellow beam of light. The pillar next to the crystal collector has a beam of light flowing through it.
Put a mirror in it and reflect the light north.
Walk north to the next pillar. Add a mirror and reflect the light west.
Go west, add a mirror, and reflect the light south.
Go south to the next pillar. Use your yellow crystal on it to dye the light yellow.
Go south and put a mirror in the pillar. Reflect the light east.
This part is very frustrating. You must climb across several handholds, but each one can be failed, so you have a very good chance of falling off. Falling will hit 5 damage on you, and several Shadows will attack you. Go back up the stairs and try again until you make it. It helps when you have full run energy when trying the handholds. There are some safe spots to wait for 100 percent energy.
Pass through the blue door and open the chest. You will get some more mirrors and a cyan crystal.
Pink door
Go back to the crystal collector and pull the lever. Collect all of your items.
Go west and put a mirror in the pillar. Reflect the light north.
Walk north to the next pillar. Add a mirror and reflect the light west.
Go west to the next pillar and use the yellow crystal on it to dye the light yellow.
Go west to the next pillar. Add a mirror and reflect the light north.
Go north to the next pillar. Add a mirror and reflect the light east.
Go east to the next pillar and add the cyan crystal. This will dye the yellow light green.
Go east and pass through the pink door. Open the chest to get more mirrors.
Cyan door
Go back to the crystal collector and pull the lever. Collect all of your items.
Go west and put a mirror in the pillar. Reflect the light north.
Walk north to the next pillar. Add a mirror and reflect the light down.
Go downstairs to the bottom floor. If you did the above step correctly, you should see a little beam of light coming out the pillar north of the stairs. Put a mirror in it and reflect the light west.
Walk west to the next pillar and reflect the light north.
Go around to the pillar north of the one you just put a mirror in. Use a mirror on it and reflect the light up. If done correctly, you should see a little beam of light flowing up.
Go back upstairs to the middle floor and find the pillar with a little beam of light flowing up. Put the yellow crystal in that pillar to dye the light yellow.
Go up the ladder to the top floor. Put a mirror in the pillar and reflect the light west. It should pass through a pillar that has a purple crystal in it. The yellow and blue will cancel each other out, leaving you with a red beam of light.
Go back down the ladder and go south. When you reach the south wall, go up the ladder. Then go as far north as you can, as far west as you can, and all the way to the northwest corner. Put a mirror in this pillar and reflect the light south.
Follow the beam to the southwest corner and add a mirror. Reflect the light down.
Go back down the ladder that you just climbed up. Then find some low walls west, then north and west of the ladder, climb over them, use your rope on the rock, and climb down. Pass through the door and open the chest to get blue crystal.
Yellow door
Go back to the crystal collector and pull the lever. Collect all of your items.
Go west and put a mirror in the pillar. Reflect the light north.
Walk north to the next pillar. Add a mirror and reflect the light down.
Go downstairs to the bottom floor. If you did the above step correctly, you should see a little beam of light coming out the pillar north of the stairs. Put a mirror in it and reflect the light west.
Walk west to the next pillar and reflect the light north.
Go around to the pillar north of the one you just put a mirror in. Use a mirror on it and reflect the light up. If done correctly, you should see a little beam of light flowing up.
Go back upstairs to the middle floor and find the pillar with a little beam of light flowing up. Put the cyan crystal in that pillar to dye the light cyan.
Go up the ladder to the top floor. Put a mirror in the pillar and reflect the light west. It should pass through a pillar that has a purple crystal in it. The cyan and red will cancel each other out, leaving you with a blue beam of light.
Go back down the ladder and go south. When you reach the south wall, go up the ladder. Then go as far north as you can, as far west as you can, and all the way to the northwest corner. Put a mirror in this pillar and reflect the light down.
Go to the bottom floor. In the northwest corner, pass through the yellow door, rotate the mirror south and pass through the door. Go south, then east, then go open the chest to get more mirrors and a fractured crystal.
Pink and yellow doors
You now need to open two doors: A new pink door and a new yellow door, using your fractured crystal. Go back to the crystal collector and pull the lever. Collect all of your items.
The first thing you need to do is open the blue door again. Follow the above steps to open it. Yes, you need to cross those handholds again. Once you get inside, use your blue crystal on the pillar, then exit. Collect your mirrors and yellow crystal by walking around and getting them by hand. Do not use the crystal collector unless you want to repeat the above step, which you don't.
Go back to the first pillar with the light beam shining up and add a mirror. Reflect the light north.
Go north to the next pillar. Add a mirror and reflect the light west.
Go west to the next pillar, add a mirror, and reflect the light up.
Walk to the south end of the room, climb up the ladder, and go north. Make your way to the next pillar. Add a mirror and reflect the light south.
Make your way south to the next pillar. Add your fractured crystal to split the beam into three parts. You will use one of these to open the pink door and the other to open the yellow door.
Pink door
From the fractured crystal, go west to the next pillar. Add a mirror and reflect the light down.
Go down to the bottom floor and find the pillar with a little beam of light coming out (head south, then west from the stairs). You will see that a green crystal has dyed the light green. Add a mirror and reflect the light south.
Go south, add a mirror, and reflect the light east. This will unlock the pink door. If you go through however, you'll find that there's still a yellow door between you and the chest.
Yellow door
From the fractured crystal, follow the beam of light south. Add a mirror and reflect the light east.
Go east to the southeast corner. Add a mirror and reflect the light down.
Go down to the bottom floor.
Go to the southeast corner. Pass through the pink door, then add a mirror to the pillar inside. Reflect the blue light north and pass through the door.
Open the chest to get more mirrors and another fractured crystal.
Cyan and black doors
You now need to open two doors: A new cyan door and a huge black door, using everything you have. Go back to the crystal collector and pull the lever. Collect all of your items.
Go west and put a mirror in the pillar. Reflect the light north.
Go north to the next pillar, add a mirror, and reflect the light down.
Go to the bottom floor. Go north and add a mirror to the pillar with light coming out. Reflect the light west.
Go west to the next pillar and add a fractured crystal to split the beam. If it doesn't work, take it out and use the other one.
Go south to the next pillar and add another fractured crystal to split the beam.
You now need to get a red beam, a blue beam, and a green beam of light pointed at the column in the final room. This will make a new clear beam that you can use to enter the black door.
Green beam
From the second fractured crystal, walk west, put a mirror, and reflect the light up. This will make it go through the green crystal.
Go to the top floor from the south ladder on the middle floor. Find the column with the green light coming out, add a mirror, and reflect it west.
The light will then reflect off of a mirror already in the final column and go down. It will now be in the final room pointed at the final pillar.
Blue beam
From the second fractured crystal, walk east. Add a mirror to this pillar and reflect the light up.
Go to the top floor. Find the pillar with a little beam of light coming up and add a mirror. It should be directly south of the black crystal. Reflect the light west.
Follow the beam of light to the next pillar. Add a mirror and reflect the light north.
Follow the beam of light to the next pillar and add a mirror. Reflect the light west.
Go west to the next pillar. Add the blue crystal to dye the beam blue.
The blue beam will then reflect down off of a mirror already in the next column. It will now be in the final room, pointed at the final pillar.
Red beam
From the first fractured crystal, walk north. Add a mirror and reflect the light up.
Go to the middle floor and find the pillar with the beam of light coming up. Add the yellow crystal to dye the light yellow.
Climb up the ladder to the top floor. Add a mirror to the pillar and reflect the light west. It will go through a purple crystal, where the blue and yellow will cancel each other out, leaving you with a red beam.
The puzzle has been completed!
Go back to the middle floor. Go to the south end, climb up the ladder, and make your way to the northwest corner. Add a mirror and reflect the light south.
Go south to the next pillar. Add a mirror and reflect the light east. It will now be in the final room, pointed at the final pillar.
Go down the stairs in the middle of the top floor, then go down the next set of stairs. Go through the cyan door. Turn the mirror towards the final pillar to merge it with the other two beams. It will be pointed at the black door.
Pass through the now white door.
The death altar
After you go through the final door, talk to the dwarf. He will give you a death talisman if you give him the following items:
Rope
Spade
Iron pickaxe
Iron axe
Knife
Plank
Pie dish
Potatoes(10)
Pot of flour
Bucket of milk
Ball of wool
Oak logs
Chisel
Shears
Needle
Thread
Cooked meat
Iron nail
Unicorn horn dust
Bronze bar
White berries
Hammer
Potato cactus
Skull
Babydragon bones
Facemask
Pure essence
Lobster pot
Fishing rod
Tinderbox
Lockpick
Bronze med helm
White apron
Jug of wine
Kebab
Leather boots
Redberries
Cheese
Vial of water
Flax
Gold ring
Egg
Leather gloves
Cake tin
Necklace mould
Rotten tomato
One of these three tickets: Ranging guild, agility arena, or Castle Wars. Which one you have to find is random.
One of these three books: Crumbling tome (find at the entrance to the Barrows), battered book (search the bookcases in Seers' Village), or Priffindas: A History (search the bookcases in Lletya). Which one you have to find is random.
The death altar.
One of these three keys: Jail key (kill the Jailer in Taverley dungeon), dusty key (with the jail keys, free the prisoner to get this), or door key (search the pots in Taverley near the Witch's House).
You can give these items in more than one load. If you teleport out, make sure you turn the mirror towards the cyan door. Otherwise, you'll lock yourself out and you'll have to go through the Underground Pass and enter the tunnel near the dwarf camp or redo the final puzzle. The entry at the dwarf camp is most easily reached from the Lletya village, which is fairly close to the elf land side of the underground pass. Doing the underground pass in reverse to get to the dwarf village is a lot easier.
Use your death talisman on the death altar, then use the crystal that Arianwyn repaired for you on it to charge it. Exit the death altar, and then exit the final chamber and make your way to the black crystal that you observed at the beginning of the quest. Use this charged crystal on the black crystal. This will stop people from entering the temple for another thousand years! Go back to Lletya and talk to Arianwyn for your reward.
Speak to Arianwyn in Lletya.
