Vulcanicity is a system whose purpose is to indicate how much volcanic activity exists in a given area. This is a useful tool for potential hunters and explorers since generally the higher vulcanicity is on a map, the more dangerous it is.
Vulcanicity is measured on a scale of 0 to 5:
0- no volcanic activity whatsoever. This is the vulcanicity level on most maps.
3- active volcanoes and lava fissures are present, but not in large numbers. Examples of this are in The Ancient Temple.
5- hell on earth. The highest level of vulcanicity possible for carbon-based life to endure. An example of this is in Hell Island.