What's black, black, and black all over? ...aside from vantablack.
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And here we have one of those other "things" in the region - the Demon Knight.
This advanced form of Wraith Knight usually does double-digits when it attacks (upwards of 20, like the Knight from earlier), and that's on top of its unusually high dodging rate. Demon Knights are easily the more dangerous of the two new encounters we've seen here - give it a chance to, and it WILL put you in the red (at least at this level).
Demon Knights are why this area isn't exactly ideal for grinding - even if it doesn't kill you, you'll still have to burn through MP and Herbs to heal (assuming you didn't get lucky during battle), and it'll eventually force you to retreat from the area to recover (hope you have Wings, or the Return spell. Leaving this place on-foot while badly wounded is ill-advised).