Board Thread:Game Help/@comment-28684741-20170515215009

While exploring a multiplayer world my friend and I shared, I found the Tavernkeep and took him in. I saw he had the Esthan....ethan... I forget the name... crystal and crystal stand. Not knowing what it was, I didn't buy it and took to the wiki for answers.

I know it summons Old One's Army, and I want to know if there are certain points I need to cross before I know I'm ready to take them on (possibly alone). Help? 