3rd Class change requires finished Marlon quest and has 3 parts. Step 1: Locate Priest Devin NPC in Crywolf MAP. To do this, you need to warp on Lorencia MAP and follow the arrow sign on my screenshot below. There you will see the GATE to ENTER the Valley of Loren MAP.
Step 2: Once on Valley of Loren: Locate and ENTER coor 160, 42. See my screenshot below.
Step 3: Meet NPC Priest Devin to start the quest.
Part 1 (Certificate of Strength)
Completion Requirement: Atleast Level 380 or above with 5 mil zen. You need to look for this 3 Quest items and submit to Priest Devin when completed.
Each of this 3 items drops from special monsters
Feather of Phoenix drops from Phoenix of Darkness which can be found in Icarus(30 235).
Flame of Death Beam Knight drops from Death Beam Knight which can be found in Tarkan 2 (coord 160 225)
Horn of Hell Maine drops from Hell Maine which can be found in Aida 2, in 3 different spots. (110 150),(110 50) and (120 100).
Once completed go back to Priest Devin NPC submit the 3 quest items and Proceed to:
Part 2 (Infiltration of Barracks of Ballgas)
Completion Requirement: Must be level 400 and have completed the 1st quest, and have 7mil Zen with you.
Completion Method: Enter the map Barracks of Ballgass and kill 10 each of Balram(Hero), Death Spirit(Hero) and Soram(Hero).
Completion Reward: Extra 10 Stat points to spend.
Having a party with other players is allowed and still counted.
Where to proceed? Go back to Crywolf MAP where Priest Devin is Located and follow my screenshot below to Enter Balgass Barracks
kill 10 each of Balram(Hero), Death Spirit(Hero) and Soram(Hero) and Submit it to Priest Devin.
Next Proceed to Part 3 (Into The Darkness)
Same Map: Balgass Barracks
Conditions and Rewards: Quest Starting and Ending : NPC Priest Devin, Dialogs readings.
Completion Requirement: Must be level 400 and have completed the 2nd quest, and have 10mil Zen with you.
Completion Method: Enter the Refuge of Ballgass which is located inside at the end of Barracks of Ballgass, and kill 1 Dark Elf(Hero).
Completion Reward: Extra 20 stats points to spend, 3rd Class Job Change completed.
Kill Count Gaining Method: The one user(or party) that has done the most damage to a current monster earns the kill count.
Here are all classes:
Dark Knight -> Blade Knight -> Blade Master
Dark Wizard -> Soul Master -> Grand Master
Elf -> Muse Elf -> High Elf
Magic Gladiator -> – none -> Dual Master
Dark Lord -> – none -> Lord Emperor
Rage Fighter -> Fist Master
Summoner->Bloody Summoner->Dimension Master