Skill Abilities

// 00574080 (2.0)
bool32_t multiplyExp2;  //0x596C

// 00574090 (1.5)
bool32_t multiplyExp1;  //0x5970 (not used)

// AbilityValue from skill data
int abilityValue = skill.AbilityValue;  // e.g., 150, 500, 1000

// Convert to multiplier (must be > 100)
if (abilityValue > 100)
{
    float multiplier = abilityValue / 100.0f;
    exp = exp * multiplier;
}

// Examples:
// AbilityValue = 150 → multiplier = 1.5x
// AbilityValue = 500 → multiplier = 5.0x
// AbilityValue = 1000 → multiplier = 10.0x

To test Skill Ability 87:
1. Obtain Item 101112 or 101113
2. Use the item to learn Skill 432
3. Activate the skill
4. Kill monsters to receive multiplied experience

[ERROR] Packet underflow: Expected 21 bytes, received 20 bytes

-- Create the item
INSERT INTO Items (ItemID, ItemName, Type, TypeID, Effect)
VALUES (999999, 'Custom EXP Stone', 100, 1, YOUR_EFFECT_ID)

-- Create the skill
INSERT INTO Skills (SkillID, SkillName, Ability, AbilityValue)
VALUES (999, 'Custom EXP Buff', 35, 300)  -- 3.0x multiplier

-- Link item to skill
UPDATE Items SET SkillID = 999 WHERE ItemID = 999999

void CUser::AddExpFromUser(uint32_t exp, CMob* mob)
{
    // Check for active EXP buff skills
    auto skill = GetActiveSkill();
    
    if (skill && (skill.Ability == 35 || skill.Ability == 87))
    {
        if (skill.AbilityValue > 100)
        {
            float multiplier = skill.AbilityValue / 100.0f;
            exp = static_cast<uint32_t>(exp * multiplier);
        }
    }
    
    // Original experience addition code
    AddExp(exp);
}