Mindless, lifeless, undead ...

[Taqwus]

Mindless dissolve -- not instantly, but they stay in place, skip their turns, and have a chance of taking damage each turn. Depending on their type, they may still be dangerous (for instance, due to aura effects) until they are killed.

Other magic, undead or demon units without appropriate leadership are supposed to rout.

[UninspiredName]

As for the 'fear' question, mindless units have morale 50 so it's unlikely (If not impossible)that they'd flee in the first place.

Lifeless units don't get any protection from Fear, nor does undead. In fact, Vampires are specifically stated as being cowardly.

[Agrajag]

UninspiredName said:
Lifeless units don't get any protection from Fear, nor does undead. In fact, Vampires are specifically stated as being cowardly.

Then again, immortals never route in friendly dominion
(unless that was changed from dom2)

[Cainehill]

Eh, immortal _commanders_ wouldn't route in friendly dominion, immortal _units_ would. With the massive changes in the morale system (and large quantities of bugs), it wouldn't be surprising if immortal pretenders retreated now.

[Agrajag]

Cainehill said:

Eh, immortal _commanders_ wouldn't route in friendly dominion, immortal _units_ would.

Huh, interesting, didn't know that :X
If it is so than I think it should be changed

[Sheap]

Immortals of any flavor should never rout in friendly dominion. If they do, I would call it a bug.

[Wick]

Immortal commanders don't rout. Having to deal with the lich raised my losses from 2 to 23, how sad.

[Hullu]

Sheap said:
Immortals of any flavor should never rout in friendly dominion. If they do, I would call it a bug.

At least from a realism point of view it's not a bug. Dying, even if immortal, is still likely to be very ... painful, thus, not desirable, thus, a reason to rout.

[Graeme Dice]

I've seen a vampire count rout in a battle that the other two won, so immortal commanders definetly rout now.