ConLevels

Con Levels indicate the relative level between the Player and a Monster or Excavation.

A Monster's Con Level indicates the difference between the Player's and the Monster's level.

An Excavation's Con Level indicates the difference between the Player's level, and the level of the Monsters in the Excavation. Additionally, larger Excavations tend to have higher Con Levels.

Not completely tested, but Con Levels seem to follow this pattern: