CFinaleTrigger

is a code class in linked up to three classnames.

Classnames:
 * - A prop at the end of most L4D campaigns that causes the finale to begin. It is not required for a finale to be done, as shown by multiple official campaigns.
 * - Unused, worthless entity.
 * - Another entity from the same class that appears to operate slightly differently. This entity was used in the finale for The Sacrifice (referred to as DLC3). Functionally identical to  with Is Sacrifice Finale set to Yes.