This is google translate to Korean's official update site.
source: https://lineage2.plaync.com/board/l2awknupdate/view?articleId=194381&viewMode=list&size=20
4. The 17th anniversary main class change event is in progress.
-Details related to main class change are as follows.
Requirements
Level 85 or higher Awakening Class
Required item
1 Stone of Fate, Class Cloak
Place and NPC
NPC Erathone assigned to the Temple of Einhasad in Aden Castle Town
Delete skill
Skills unique to each class (including rune stones and skills learned with advanced rune stones), dual authentication skills
Maintenance skills
Dual Class Certification Skills, Forgotten Power Skills, Race Unique Skills, Noblesse/Honors Skills, Transformation Skills, Spear of Eratone, Shield of Macia Skills, and some other special skills that can be learned from the history book, ※ The maintained skill is the skill level Also stays with you.
-You can receive one'Destiny Stone' for free through'Colossus Red' at the top of the first red balance. Additional purchases can be made later as needed.
-If you proceed with the main class change, the'Class Cloak' will be repaid for the changed job.
-You cannot change to the same class as the dual class.
-Some classes can only be changed to specific races.
class
tribe
Tyr Maestro
Dwarf
Is Dominator
Oak
Gravity Ranker
Artea
Saiha's Shea
-If you change the main class, the Olympiad score will be reset to 1,000 points, and the runes of the 1st/2nd place in the Olympiad class will be deleted.
-Legend/Hero or Legend/Hero standby characters cannot change the main class.
-You cannot change the main class while transforming or summoning a pet/sub.