Merlin's Crystal/Quick guide

Getting started

 * Talk to King Arthur about joining the round table.
 * Talk to Sir Gawain nearby. Ask everything you can.
 * Talk to Sir Lancelot upstairs about the stronghold.
 * Go to Catherby docks and talk to Arhein about riding his ship.
 * Hide in the crate north of the candle-maker.

Inside the keep

 * Climb to the top floor.
 * Attack Sir Mordred.
 * Spare his life to discover how to save merlin.
 * Exit the keep and kill a bat if you don't already have bat bones.

Black candle

 * Talk to the candle-maker in Catherby about black candles.
 * Take the insect repellent from the house north of the bank.
 * Run west to the bee hives.
 * Take the bucket.
 * Use the insect repellent on any bee hive.
 * Use the bucket on the same hive.
 * Return to the candle-maker.

Excalibur

 * Talk to the lady of the lake in southern Taverley.
 * Teleport to Port Sarim.
 * Buy a loaf of bread from the food shop. (Costs 24 gp)
 * Enter the jewellery store to the north.
 * Give the beggar your bread.

Ritual

 * Go to the Zamorakian temple in south-east Varrock.
 * Check the chaos altar's inscription.
 * Return to Camelot and enter the gates.
 * Run East of the castle to the ritual site.
 * Stand on the star and light the black candle.
 * Drop the bat bones on the star.
 * The magic words are "Snarthon Candtrick Termanto".

Finishing up

 * Enter the castle and climb the south-east tower.
 * Smash Merlin.
 * Talk to King Arthur.
 * Quest complete!