Specifically, what values make a creature flee when injured and become neutral after some time has passed?
Most creatures with "fear_trigger": ["HURT"] flee when their health drops down by half and below.
To make a monster neutral is to trigger its placate condition. For example: A angry(hostile) wolf is nearby a chunk of meat, so its aggression goes down slowly until it becomes neutral(tracking) 
3 Likes
I never new that was in the game for wolves. I just watch them and the moment they go red-alert I explode them with an arrow.
How do I make monsters become neutral on their own? I’m talking like ants and more ants being forever pissed off because a dog bit off more than it could ever chew.
Giant Ant
[
{
"id": "mon_ant",
"type": "MONSTER",
"name": "giant ant",
"description": "An enormous red ant covered in chitinous plates. It possesses a pair of wriggling antennae and vicious-looking mandibles.",
"default_faction": "ant",
"bodytype": "insect",
"species": [ "INSECT" ],
"volume": "62500 ml",
"weight": 81500,
"hp": 40,
"speed": 100,
"material": [ "iflesh" ],
"symbol": "a",
"color": "brown",
"morale": 60,
"melee_skill": 5,
"melee_dice": 1,
"melee_dice_sides": 6,
"melee_cut": 6,
"dodge": 1,
"armor_bash": 5,
"armor_cut": 10,
"vision_day": 5,
"vision_night": 5,
"harvest": "arachnid",
"upgrades": { "age_grow": 14, "into": "mon_ant_soldier" },
"anger_triggers": [ "FRIEND_ATTACKED", "FRIEND_DIED", "HURT", "PLAYER_WEAK" ],
"death_function": [ "NORMAL" ],
"special_attacks": [ [ "EAT_FOOD", 30 ] ],
"flags": [ "SEES", "HEARS", "SMELLS", "CLIMBS" ]
}
]
There’s no way you can appease an ant. They’re like machines for war and you can’t stop them from charging to their death 
Few monsters (mostly carnivorous mammals) do become neutral at the wilderness. If a wolf kills a deer, the dead body placates them. Err, it rarely happens 