// Create a Damage Over Time (DOT) effect.
// - nAmount: amount of damage to be taken per time interval
// - fIntervalSeconds: length of interval in seconds
// - nDamageType: DAMAGE_TYPE_*
effect EffectDamageOverTime(int nAmount, float fIntervalSeconds, int nDamageType=DAMAGE_TYPE_MAGICAL);

The amount of damage inflicted by this function will remain constant over the course of the effect's duration. For instance, entering d6(3) as nAmount will not produce a random amount of damage each interval, but the random number generated when the function is first called.