The ultimate source of bro truths and man wisdom. They are usually the last stopping ground before making major bro decisions, such as what fantasy player to draft first or what to do when your new girlfriend has a freak out for the first time. Multiple Broly Grails can exist, but are few and far between, and will naturally default into a general hierarchy, such as the Jedi.
Ask Dan for advice about the three girls you're dating, after years of crazy relationships, he's the Broly Grail for this type of thing.