Valten has a 5+ Ward save.

In addition, if Valten is killed, take a Leadership test for him at the end of that phase. If he passes, his astounding strength of will allows him to ignore the wound and continue fighting. He remains alive on 1 Wound, and the wounds that killed him are discounted.

Note that the effects of combat resolution, panic and so on are worked out after determining whether Valten recovers. This rule does not apply if he is fleeing and is run down by chargers or pursuers, or hit with a Killing Blow.