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Fear is an attack on the Morale of another being. It has many sources, of which the Fear Aura is the most common. The core purpose of Fear is force a rout in the enemy, greatly reducing the amount of bodies one has to cleave through in their bid for domination or survival.
Units with THIS icon in their stat sheet have a Fear Aura. Each round, a unit with an Aura has just under 24 chances to cover either the square they're on or an adjacent square (including diagonals) with its Aura. The listed value of a Fear Aura, plus 6, is a little under how many times a Fear Aura will flash a random square each round.
How much of an effect does a Fear Aura have?