The "strong" and "dextrous" traits, and you.

[The1exile]

a better example is that troll whelps and HI can get the fearless trait. if you are defending against an enemy attack in unfavorable TOD, then you should put the unit that is best suited for the situation in the front lines and fearless vs not-fearless can become extremely significant in this situation.

Ghouls can get fearless also.

[grzywacz]

Don't forget about strong ulfserkers.

[Caphriel]

a better example is that troll whelps and HI can get the fearless trait. if you are defending against an enemy attack in unfavorable TOD, then you should put the unit that is best suited for the situation in the front lines and fearless vs not-fearless can become extremely significant in this situation.

Ghouls can get fearless also.

In fact, Ghouls (and Walking Corpses) always have fearless. It's the only trait undead units (as opposed to units from the Undead faction) get. Considering how little damage Ghouls deal, and the fact that they cause poison, fearless is little more than a perk on them.

[Pentarctagon]

Don't forget about strong ulfserkers.

while the strong/resilient traits do help, the wose still has a chance of killing the ulfserker at night and it is almost suicide during the day since the wose simply deals so much damage per hit that the hp is a minor difference. and this is on the best terrain defense the ulfserkers can get.

[manored]

while it doesn't mean that you will lose, taking a unit's traits into account would help you win.

I agree.