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So I was looking through the warscroll builder and found that the skin wolves are listed under the units for beasts of chaos. However, I do not see any instances of this in the Monstrous Arcanum entry. So is this an error in the program, or is there an errata for this book I missed?

Looks like they only have the keywords Chaos/Monsters of Chaos/ Skin Wolves. So despite the Warscroll Builder listing they wouldn't be getting any Beasts of Chaos goodies or buffs. Too bad really, they should be immune to those Endless Spells!