What options are available as a pale master to cleanse charisma stat damage that we receive while in an undead shroud? When I use lesser restoration potions I get the message "(Combat): You are immune to your lesser restoration." and it doesn't heal any of the charisma damage.

This became a huge issue as I was soloing The Dreaming Dark and very quickly got to "Helpless" due to being unable to remove any of the charisma damage he lumps on regularly