Invisibility

Invisibility is a game mechanic present in many games. As the name implies, an Invisible unit cannot be seen by the opponent unless Detection is present. A unit with Detection is also called a Detector.

Invisibility is a buff which dispels upon attack or casting a spell. Moving on the other hand, may or may not break invisibility, depending on the the ability.

Sources of Invisibility:
 * Priests (Exalted) have the Cloak ability, which when cast on an ally, turns it Invisible.
 * All Fallen ground units can gain the Conceal ability, which allows them to turn Invisible at night. Moving, however, breaks Invisibility.
 * Shadow Drakes (Fallen) can gain the Shadow Rush ability, which turns them Invisible temporarily.

Sources of Detection:
 * Units: Sentinel Owl, Celestial Faerie, Aeon Skywagon.
 * Structures: Obelisks, Exalted Town Halls, Azure Lanterns, Watch Towers.
 * Abilities: Track, Oversight.