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ENABLE_SECONDARY_SKILL_TREE

Secondary Skill Tree System unlocks the character’s second skill group at a configurable level, default 90.
Players can upgrade secondary skills through a custom in-game board.
Upgrade costs are fully SQL-based: yang + up to 12 required items per skill level.
Supports Normal, Master, Grand Master and Perfect progression up to level 40.
Secondary skills work with quickslots and stay correct after relog.
The original skill system is fully preserved and macro-protected.
Server-side checks prevent bypass, wrong skills, missing items, missing yang and max-level abuse.
Normal skill resets do not delete secondary skill progress.
Cost tables can be reloaded in-game with /reload s.
Clean, configurable, and production-ready late-game progression system.

Note: I am not responsible for possible issues in free shared systems; not every case may be fully focused/tested, and final checks are the user’s responsibility.