So the Valkyrie can resurrect any follower that dies. There's this awesome follower (something Martyr) who will die for you when losing a battle. Does this make the Valkyrie immortal? I looked at the wording and it seems to fit.

Also, the Vampiress can steal followers. Does this mean she can steal followers from the Ogre King who has turned a Monster into a follower? If she can, does she have the ability to use its strength in a battle?

turch said:

There is a 2-page thread on the Valkyrie in the Rules Questions section.

turch said:

Vampiress or Sorceress can't steal the special Followers off of Minstrel (Animals), Ghoul (Raised) or Ogre Chieftain, because they don't have the Follower keyword (though act like followers for the character who has them).

P.S. Yes, there is a Rules Questions subsection .

Is it allowed to take (dicscard) the special followers with a spell?

Rimmer said:

No. Some abilities/Spells/Objects allow you to take Enemies as Followers, but they are not Followers. Any effect that targets Followers does not apply to them, including Spells. If they're dropped, lost or ditched, they're discarded.

The only doubt I have and don't remember from past discussions is about the Gladiator. If he takes such Enemies as Followers, does he get the +1 in battle also for these?