Out of all the time I've played Battlemaster... I've never had an adventurer killed by Undead or Monsters.
There was a time on BT when the hordes couldn't and the monsters and undead didn't refresh... So it was basically a maxed out region where you could only hunt 1 group before basically losing....
Did it on high risk on each undead and monsters... Didn't die.
I guess a good tip for being a good adventurer is: Have good luck ;P