Fear

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quote from a dev

Yes, and every full five makes the morale roll 1 more difficult. Fear 0 is area 5 no morale mod. so a critter with fear 15 has area 20 -3 fear mod. A death mage with 1 death, area 1 morale mod -1. The fear roll works like morale in battles, which means I am not entirely clear about the details, but squad size average morale etc will factor in if squad flees or not.