Killing named horrors?

[TwoBits]

If you manage to kill or at least defeat a named horror, is that unit out of the game, or can it return later?

I actually managed to put the kibosh on Hruvur, the Abomination of Desolation, a great fish-skull looking thing, thanks to a Ring of Warning and 10 exceptional bodyguards (8 of whom were killed before Hruvur packed it in), and I'd rather not have to see him again (yeah, someone has put up Astral Corruption).

Is he permanently gone, or can he come back?

And just how many of these uber-horrors are there (on the off chance that once they're gone, they're gone)? I almost managed to beat something called Agon, Eater of Dreams, before he managed to panic my commander (with his Fear 15!).

I'd like to think that if I managed to somehow to actually defeat all of the really nasty ones, Astral Corruption wouldn't be such a hassle. Seems unlikely though...

Anyhow, this is my first run-in with A.C., so any ideas on what to expect (I got kinda lured into a false sense of security, after I only saw one lesser horror the first two turns of the global), and how to deal with it, would be greatly appreciated!

[Jazzepi]

If you have astral mages, you can script them to cast "returning". Make sure to give them astral gems.

Jazzepi

[TwoBits]

Not really on option for my most important mages. It's either run the risk of slugging it out with a horror, or watch my gems seriously depreciate in value

[cupido2]

I don't know how many there are of them, at least 3 or 4, they come back after defeat and "Returning" is the best way to deal with them. "Charm" worked sometimes too but I wouldn't relay on that.

[Endoperez]

Hunter of Heroes
Eater of Gods (check out the "true ethereal" ability he has in his second and third forms)
Kurgi, Slave to Unreason
Eater of Dreams
Abomination of Desolation
Maker of Ruins (check out his siege bonus value)

[Baalz]

I'm not sure about killing them, but I do know that you can send them to hell via one of the level 9 blood spells and they will not come back until/unless they can find their way back.

[Edi]

They really ought to add a new Doom Horror into the game, the Hunter of Bugs...