I found a dark tunnel after finishing an exploration mission containing invisible enemies. After sneaking through/ speeding through on my sparrow :D I found more invincible enemies and pretty much died instantly, has anyone else found anything like this ??????
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I found the Hive Ogre and rode Pikes in Old Russia
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If you're talking about the level ?? monsters, they aren't actually invincible. They're just level 11, so until you're within a certain range of their level, your level-scaled damage output can't overcome their level-scaled defense score. When you hit the level cap, the question marks will disappear and their actual level will be displayed. There's other stuff like them strewn about the maps.
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Most people have found that, since if you have a sense of exploration, you'll surely encounter that amongst your travels. Overall, it's not much of a secret anyways. FYI, They aren't invincible, I've killed one before, it just takes determination, and a whole lot of rinse and repeat.