Befallen has lots of issues with regards to pathing in that most mobs will simply run through walls to get to you. They don't follow the paths and hallways like other zones.
The ice boned skeleton you're seeing is a placeholder I believe for Gynok Moltor. There are a number of higher level place holders that will spawn there including a ghoul, a mummy or Gynok himself who will whoop your ass far faster than the ice boned skeleton.
Basically, it was like this one live and is one of the quirks of an old world dungeon like this.
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Yumyums Inmahtumtums - 59 Shaman
Lemonspoon Icebeaner - 52 Enchanter
Yumyums Inmahtumtums - 60 Enchanter
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