Developing generals by gaining experience points (EXP) and reaching the maximum level 9 is a key mechanic that transforms generals from "powerful warriors" into "strategic units" with high impact. Details are as follows:

1. EXP System and Leveling Up

• Source of EXP: Generals gain experience from participating in battles and defeating enemy units.
• Level-up Speed: Generals level up faster than regular soldiers, needing only 30 EXP to reach level 2, while Sergeants require 100 EXP.
• Stat Growth: Each level increase boosts the general's stats (Attack, Defense, HP) according to their class (Attacking, Defensive, Wizard, Intelligence).

2. Skill Points and Skill System

• Skill Points: Generals receive 2 points per level, totaling 16 points by level 9.
• Specialization: Limited points (16 total) require players to specialize the general in only 1-2 skills for maximum effectiveness.
• Skill Unlocking: At level 9, generals can access all skills of their class, with 40-50 skills available in total.

3. Key Milestone: Passive Health Regen at Level 9

• Level 1-8: Generals do not regenerate HP automatically, requiring reliance on supply carts or healing skills.
• Level 9: Generals gain passive HP regeneration at 3 points per 2 seconds (high game speed) or 3 seconds (low game speed), greatly enhancing battlefield endurance.

4. Impact on Administration and Military Systems

• City Management: High-level generals are essential for official positions in major cities.
• Loyalty and Rewards: Loyalty tends to decrease as generals level up, requiring players to manage risks with titles or gold to prevent defections.
• Resurrection Cost: If a general dies in battle, the resurrection cost depends on level; level 9 costs up to 1,000 gold.
• Cheat Codes for Testing: Players can use {levelup} to increase one level or {levelmax} to reach maximum level instantly.

In summary, bringing a general to level 9 is not just about increasing attack power, but achieving self-sustainability through passive regen and greater authority in empire management.