I'm not certain about the challenge ratings. I'm going to do some more comparisons to the Monster Manual to determine. It's hard to tell how much tougher the damage resistance makes these creatures.
I tried to make the spell selection as close to the d20 version, but I think I need to add in a "Rage" equivalent because that would appear to be an important component of the tactics of the 3.x version. If you have any suggestions for the spell abilities, let me know in the comments.
Note: This version of the Barghest comes from the d20 System Reference Document with the stat block converted by the D&D 1E/3E to 5E Monster Converter by +Brent Newhall. It is presented under the terms of the OPEN GAME LICENSE Version 1.0a.
