there is , of course , scarce space in these pages to tell the stories of those early shadowhunters , blazing their warrior 's trails across earth , but we encourage the interested shadowhunter to seek out some of the more interesting tales in the library of their local institute : the tale of the first institute on the british isles , in cornwall , where the first nephilim arriving with the cup were believed to be wielding the holy grail , and whose tales of bravery and vigor have become mixed up with the mundane folklore of the isles .