8. Apply Damage and Buffs

The example uses effect payloads to carry caller-owned meaning:

enum EffectPayload {
    Damage { amount: f64 },
    AttackSpeedBonus { amount: f64 },
    MaxHealthBonus { amount: f64 },
    Bleed { damage_per_tick: f64 },
    Cooldown,
}

Slash applies an instant effect. The effect action mutates current health and only then emits an executed fact.

Quickened Strikes and Fortify apply duration effects. They do not directly mutate attack speed or max health. Instead, the derived attribute calculators read active effect instances and compute the current values.

In the compiled demo:

• enemy health falls from 80 to 68
• attack speed rises from 1.0 to 1.5
• max health rises from 100 to 125

Next: Advance Time and Expire Effects.