// this doesn't handle multiple instances of debuffs
updateEnemy()
{
    if(enemy->storedBurn.base > 0)
    {
        enemy->currentHealth -= calculateStat(enemy->storedBurn);
    }

    if(enemy->storedChill.base > 0)
    {
        enemy->movementSpeed *= 1.0f - calculateStat(enemy->storedChill);
    }
}

whenAttackHitsEnemy(...)
{
    if(attack->type == FIRE_ATTACK_TYPE)
    {
        enemy->storedBurn = attackSource.damageStat + attackSource.burnStat;
        enemy->storedBurn.more *= BURN_DAMAGE_PERCENT_PER_SECOND;
    }

    if(attack->type == COLD_ATTACK_TYPE)
    {
        // This assumes that damage doesn't affect chill effect
        enemy->storedChill = attackSource.chillEffect;
        enemy->storedChill.base += 1;
        enemy->storedChill.more *= BASE_CHILL_EFFECT;
    }
}