Start: Begin by speaking to Sir Tiffy Cashien in Falador Park.
Quests: You must have at least 32 Quest Points, and have completed the Rune Mysteries, Priest in Peril, Recruitment Drive and Lost Tribe Quests. You must have also started the Zamorak Mage Mini-Quest.
What You Need: 10,000gp or a Law Rune, a Slayer Gem (bought from a Slayer Master), some Molten Glass, and 20 Rune Essence. An Amulet of Glory and some Teleport Runes are also helpful.
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Getting Started
Firstly, speak with Sir Tiffy Cashien in Falador Park. Ask if he has any jobs for you, and he lets you know that a clerk has made an error and that you're not actually permitted to join the Temple Knights if you're not in the order of the White Knights. It turns out you have to work as a squire for 5 years... Or take Tiffy's alternative.
He'll talk for a little longer about a loophole, then he'll ask you to go see Sir Amik Varze in the Falador Castle.
Sir Amik Varze
Find Amik and he'll ask you to become a squire after a small conversation. Decline his offer, and the conversation will continue. It turns out that there needs to be a crisis for you to become a knight, so go report back to Tiffy. You'll have to talk to him then go back to Amik, you "old bean." But it turns out that you are "a human bean... I mean being!"
Head on back to good ol' Varze, that old bean. He tells you the news that some bad guy named Solus is back, the "infamous murder-mage." Follow the very unclear conversation through to the end and accept his mission.
The Communication Orb
Now for the age-old last resort, back to Tiffy, that old bean. It turns out you're just the "agent." Now you'll have to make an item for him, or you could just buy it. You can hand over a law rune, a slayer gem, and a molten glass and Tiffy will make it for you, or you can just pay him 10k. Either way, you'll get a Commorb.
You Can Choose:
Scan - once in range, you can scan for Solus to find him.
Contact - allows you to contact Savant.
Use - just your normal, everyday "use" option.
Playback - will give you your current and past assignments.
If you choose contact, you can talk to Savant. It turns out you should investigate the Taverley Dungeon and you should also take a look at the Zamorak Mage that helps in Runecrafting.
Taverley Dungeon
For our first stop, let's head over to the Taverley Dungeon. Go south past the Animated Axes, past the Hill Giants, and into the Black Knight's rooms. In the southwestern-most room is Lord Daquarius. Savant advises you not to try to bluff him into giving you something. Go kill a level 33 Black Knight and he'll give in. He tells you that Solus is in a place with a lot of fur that is not bear fur.
Zamorak Mage
The Zamorak Mage in Varrock (near the Chaos Altar in the southeast corner of the city) tries to take your Orb, but Savant doesn't let him. He offers to trade his information for 20 Rune Essence. Dash up to the bank and grab them. Your character very smartly figures out he's in Canifis. Grab your Ectophials, folks, and away we go!
Chasing Solus
From this point on, you'll be chasing Solus throughout RuneScape, and each time you find him you'll receive an item. That item is a hint for where to go next. These items are always random, so here's a list of items that you may receive, along with where you should go:
Warning: After finding Solus for the third time, he will cast Flames of Zamorak on you which will reduce your hits by 4/5 (so if you have 65 hitpoints, it will hit for 52 damage).
Banana - Karamja Banana Farm
Blue Cape - Champion's Guild
Bone Spear - Lumbridge Cellar Caves - you'll find a woman but it turns out to be Solus.
Castle Wars Ticket - Castle Wars Arena
Earmuffs - Canifis Slayer Tower.
Eye Patch - Brimhaven Pub
Fake Beard - Ali Morrisane's stall in Al Kharid.
Fremennik Cloak - Rellekka
Giant Frog Legs - Lumbridge Swamp Cavern
Goblin Mail - Goblin Village
Greenman's Ale - Yanille Pub
Fur - Ardougne Market
Wizard's Hat (Cream) - Tree Gnome Stronghold
Rune Essence - Rune Essence mining cavern
Toy Horsey - Draynor Village, near Diango.
Unholy Symbol - Scorpius' Grave, north of the Observatory.
Wizard Hat - The Wizards' Tower located south of Draynor Village.
Worm - McGrubbor's Wood
Warning #2: The last place you find Solus at, you will also be confronted by a level 32 Black Knight. Additionally, be sure to pick up any pets or familiars before entering the Rune Essence mine; otherwise your pet will attack you!
Eventually you should get some Rune Essence, so head off to whichever Rune Essence teleport spot you want. Scan in there, and Savant will close off possible teleports, to trap him. After a small cutscene, she'll summon some rangers to attack, but he kills them all. Go attack him yourself and kill him (he's fairly easy) and you'll get his hat.
Talk to Amik and hand over the hat. Quest complete! He'll explain to you about the new armor system and killing Black Knights.
Rewards
5,000 Slayer experience
Access to the armory of the White Knights
1 Quest Point