Okay so the first time we got our asses handed to us but we did find out some stuff:
She used the following spells on us, Hold Person Mass, Horrid Wilting, Flame Strike and maybe a couple of others but those I remember.
We also took the collars and ran them back to town with us. We had Sal look them over. He said they were ‘tuned’ to a particular type of creature and allowed for more dominant control. He also said a dispel magic could release the collars. These were what the undead knights were wearing.
Some things we are not 100% sure of. The Knights when killed, turned into a pile of armor with the collars lying close by. It seems like they might reform over time or when something is done by the Lich. The King’s ring seems to be on a chain around her neck.
She had deeper darkness on but then lifted it when we went in. Not sure why. Also the doors were opened and we escaped but the Dwarf barely made it out (carrying Ford) before the doors slammed shut. I think she was trying to up her odds and go against just they two of them with the rest of us locked out.
Feel free to add more thoughts. It will take us two weeks to get back to the longhouse so we have time to chat and strategize.