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Stealthy units can move without being seen on the strategic map. This allows them to try to infiltrate hostile territories. Patrolling units and the inherent patrol effect from province defense can however discover them.
Almost all nations will have some access to stealth through scouts – either national ones (such as Bangar Log's Markata Scouts) or generic independent ones (Scout) – to hang out in enemy provinces and reveal what is happening there. Some nations have stealthy commanders (such as EA Ulm's Warrior Chiefs and Shamans) and stealthy troops for them to lead (such as Steel Maidens).
Notably, all "elves" (Vanir, Tuatha, etc. – see the roster of EA Vanheim for examples) are inherently stealthy, and have Glamour. Sometimes nearly everything fielded by these nations has stealth, leading to the potential for very nasty surprise attacks. This is colloquially referred to as "being elfed".
Stealthy commanders can also be summoned, notably with the early rituals Black Servant and Bind Shadow Imp.
Detection
Stealth strength = (Leader's stealth ability) - (number of stealthy units under their command with stealth ability < 50)
Destealth strength = (Sum of patrolling units' patrol strengths) - min(unrest, 100)/2 + max(0, province defense - 14)
Sneaking units are discovered if:
Destealth + 2d25 > Stealth + 2d25
Both of these rolls are open-ended.
A stealthy commander has a number of interesting uses:
Commanders set on stealthy orders (hide or sneak) are unaffected by:
Commanders set on stealthy orders are still affected by: