To start off there aren't necessarily prerequisites behind Lord of Order's questline, but some quests are locked behind storylines, and the final quest will need you to have finished the 13 Lord of Chaos saga.
It is recommended to complete the following storylines before starting the quests (or just do it while questing):
- /deadmoor (can /goto)
- /citadel and /citadelruins
- /ravenscar
- /shadowgates (can /goto)
- /gaiazor (can /goto)
- /treetitan
- /andre (can /goto) and /giant
- /newfinale - The 13 Lord of Chaos Saga
- /blackholesun (can /goto)
- /doomvault and /doomvaultb
You can start the quest from Mirror Drakath in /battleoff.
- "Heart of Servitude"
- Travel to /watchtower and go to Screen 4, kill the Chaorrupted Knight till they drop the "Pristine Blades of Order"
- Travel to /dreadrock and go to Screen 4, click on Deathgore and buy the "Dreadrock Donation Receipt" from the Dreadrock Pet shop.
- Travel to /deadmoor and kill the Banshee Mallora on Screen 33. You will need to /goto to a player who has completed this questline or complete this questline yourself. Get the "Deadmoor Spirits Helped" drop.
- Travel to /citadelruins and complete the "Defeat Enn'tropy" quest for the reward "Mage's Gratitude". You will need to have completed this questline for you to have access to the quest.
- Travel to /ravenscar and complete the questline. Once you have completed it you should be able to access the shop from Mina's Ghost and buy "Ravenscar's Truth".
- "Spirit of Justice"
- Travel to /dwarfprison and kill Warden Elfis till he drops the "Warden Elfis Detained" item.
- Travel to /prison and kill the Piggy Drake till he drops the "Piggy Drake Punished" item.
- Head to the /mysteriousdungeon and kill the mysterious stranger on screen 19.
- Travel to /dreammaster and kill the Callico Cobby on screen 6. You may need to complete the questline starting from /spookeasy if you cannot find anyone to /goto.
- "Purification of Chaos"
- There are a lot of methods to obtain chaoroot, you can kill the hydra heads as one of the faster methods
- If you haven't completed the mobius storyline, /join hydra and kill the hydras at the end.
- If you have completed the mobius storyline, /join mobius, click on Dew Drop NPC and click "The Hydra" option, this will teleport you to the 3 hydra heads
- To obtain the "Chaotic War Essence" x15 you should join /chaosboss and kill the Ultra Chaos Warlord.
- To obtain the "Chaorrupting Particles" x15 you should join /shadowgates and complete the questline. You will be able to kill the chaorruption at the end that will drop it.
- Join /stormtemple and beat lionfang till he gives you his "Purified Raindrops" x45.
- There are a lot of methods to obtain chaoroot, you can kill the hydra heads as one of the faster methods
- "Steadfast Will"
- Head to /gaiazor and take the "Gaiazor's Cornerstone" from him. You may need to complete the questline to access Screen 8.
- Head to /treetitanbattle and kill Dakka till he drops his stuff. You may need to finish entirety of this storyline. So start from /treetitan.
- Head to /andre and attack the giant necklace. You may need to finish the entirety of /giant storyline.
- Kill Desolich at /desolich for his skull.
- "Strike of Order"
- Grab the "Hanzamune Dragon Koi Blade" from killing Kitsune at /kitsune. It is somewhat low-ish drop rate.
- Grab "The Supreme Arcane Staff" from killing Ledgermayne at /ledgermayne. This is a 1% drop.
- Get the "Dragonoid of hours" from killing the Dragonoid boss at /mqlesson
- Grab "Safiria's Spirit Orb" from Safiria after clicking the "Take the Spirit Orb" button at /maxius.
- "Harmony"
- Get "Unity of Life" from /elemental and kill the Tree of Destiny.
- Join /orchestra and kill Faust for the "Harmony of Solace".
- Defeat the Pactagonal Knights at /cathedral for "Teamwork Observed".
- Defeat the Queen's Archsage in /goose for the "Scroll of Enchantment".
- "Ordinance"
- Get "Acolyte's Braille" from /newfinale and kill the Chaos Healer from willow creek, screen 2.
- Kill enemies from /wardwarf for "Suppressed Drow's".
- Kill enemies from /warundead for "Suppressed Undead's".
- Kill enemies from /warhorc for "Suppressed Horc's".
- Kill enemies from /weaverwar for "Suppressed Weaver's". You may need to complete the questline to access the rooms.
- Kill Extriki at /extriki for Strength of Resillience.
- "Axiom"
- Kill the Guardian Spirit for "Law of Nature" at /elfhame. You may need to complete the questline to access this screen.
- Kill Kathool at /deepchaos for the "Law of Time".
- Destroy the Shadowstone Support for the "Law of Gravity" at /necrocavern.
- Kill the Reflecteract at /blackholesun for the "Law of Relativity". Should be a relatively short questline.
- Kill the Tonitro at /thunderfang for the "Law of Conservation of Energy".
- Defeat the Red Dragon at /lair for the "Law of Low Drop Rates".
- "Blessing of Order"
- Kill Undead Raxgore at /doomvaultb for "Weapon Imprint" x15.
- Get Rank 7 Fishing and buy the "Lure of Order" from Faith in /greenguardwest.
- To quickly rank up your Fishing Reputation get some Fishing Dynamite by completing the "Favor for Faith" quest multiple times. Use these dynamites when fishing for fast reputation.
- Kill Ultra Xiang in /mirrorportal for "Quixotic Mana Essence". This boss is quite difficult and it is recommended to use the Healer class. When she buffs your HP, use the Healer's 2 skill to deal massive damage, as your 2 skill's damage is based on HP.
- Alternatively you could use Dragon of Time but I assume you don't have this at the current stage of the game.
- Kill Serepthys at /yasaris for "Inversion Infusion".
- "The Final Challenge"
- Kill the Champion of Chaos at /ultradrakath.
- Remember to select the Lord of Order class, or you'll have to wait another day.
I don't feel like I should make a usage guide for this class as it is very braindead, just make sure your buffs do not fade when using the class. For enhancements read Basic Class Guide.