I've made an initial attempt to convert one of the main villains in the World of Farland, the Lord of Pride, to 5th edition. Please check it out here and give constructive criticism about balance (he is a challenge 10 creature). Your feedback will be very helpful. Thanks!
Looks pretty good at a glance. I didn't do more than skim it, so I didn't check your CR calculation or anything, but the Lord of Pride seems like a cool, flavorful villain.