Most themes have one or two eligibility checks:

The second common requirement is theme eligibility. So, if the wolf event has already occurred in the current campaign for a different hero, it won't happen again until you start a new campaign. Most specific theme events can only happen once per game (campaign). In addition to those examples, there are other common requirements that must be met, such as the event cooldown. Other theme events target specific enemies (e.g., fought Drauven, and one of the dead enemies was a Drauven Skysinger). Some theme events target specific biomes (e.g., forest or swamp). For example, if the event is written (targeted) for a poet or a goofball, but no heroes had a high enough score for those specific personalities, the event would fail (and not take place). The game selects a high-scoring event from any event that matches its event targets. All you can do is continue scouting and battling enemies, until the desired theme event occurs. Since the game contains a large number of events which are not theme-related, it's very likely that a non-theme-related event occurs. Only a few theme events happen after a mission victory, or during a hook encounter. Wilderness scouting, and Arrive at hostile site events are the most common type of theme events.

A hook would be a personality trait such as Curious, Loyal, or Slacker. Hook: This opportunity arises when a hero with a matching personality trait (hook) travels across the Overland map.Mission victory: These encounters occur after a successful lair battle ends.Arrive at hostile site: These events occur before a lair battle begins.Wilderness scouting: These events occur after your heroes have completed scouting an unexplored region on the Overland map.Although there are many other types of encounters in the game, this list will only focus on specific types of encounters which can trigger a theme-related event.

Download wildermyth humble bundle