I have been thinking about this ever since I got the question! The first phase would be with his two Paladin “Champions” that the players would have to defeat first. Which he would continue to heal unless he is silenced, and if he isn’t silenced/interrupted he would resurrect one. Once they are both killed he would enter his Shadow phase. Lots of mind controlling of players over time until defeated. If not defeated in time all the players would be under his control and then sacrificed!
