If we meet the goal after the time expires, it should unlock. You are looking for a quest called Take a Break. This quest appears after finishing a quest called Gear Up. You are supposed to help Vlad the Impaler, William Shakespeare, Blackbeard, and the Twins. Each has a smaller quest, don't worry nothing out of the way just killing imps or demons. Each person gives you another arcane ability. After you get all the abilities. Look under your quest guide in the hub and you should see a quest called Take a Break, make that your followed quest and the GPS should lead you right to the chair. Kill a few demons, and hopefully as a community we should unlock it. Also you can take the chair with you just switch weapons if you want to get out of the chair.