If the current number of vampires in the world is greater than this number, then no more vampires will be born. This will not keep more vampires from being generated, only born. -1 = default, no limit.

If enabled, vampire Sims will be in their Darkforms when they initially come on any lot. However, the base game may switch them back after feeding or some other interaction.

Change Vampire experience gain to be slower or faster. Valid settings are from -10 to 10 with a default of zero. Negative is slower progress, positive is faster. 2 would be 2x faster. -2 would be 2x slower.

If enabled, when a Vampire Sim ages-up they will level-up starting at their Teen years and gain a level as they age. Note that aging for vampires must be enabled to gain the most benefit.

Determines whether vampires age normally, or if they stop aging at a specific age.

When a Vampire feeds on a Sim, these settings allow the target Sim to have a chance of becoming a vampire by accident.