Four Shadowhunters Terms You HAVE To Know! In order to help all of you Shadowhunters newbies, the cast put together a list of terms that they feel are essential for you to know! Our fearsome Shadowhunters have rustled up a video of some of the key terms used in the Shadow World. Facebook Twitter Watch Again Watch Episode Can you think of other key terms for all the newbies out there? Tell us your most important ones in the comments below!