Umbran said:The only way to (legally) know a critter's power is to either make the appropriate Knowledge check, or engage in combat.
Not necessarily. It depends on the campaign. In most fantasy worlds, even commoners, and simpletons know that dragons are dangerous creatures that burninate both peasant and countryside. So it'd be logical for players to see a dragon, and even if they couldn't gauge its age, to run for the hills.
In the same way, any creature with an ability requiring a save v. fear (dragons, certain demons, grandma in bikini season). Even if you make the save, running is a logical and valid choice. It's a scary mofo!
But reasonably, not every adventurer will recognize a bodak, or a heucuva ("Hey, Jovan! How come you haven't turned this skeleton yet?"). Players who keep metagaming to a minimum in these situations, as well as "Holy crap! It's an ogre! RUN!" ones tend to be better players.
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