Hospitality is an important concept if you want to dive deeper into some of the rationales behind the optional classes in the LMM. However, it is not necessary to play the class–it is just another nice bonus.
If you are interested, here is the key piece about Hospitality:
In the Cities, towns and even villages are few and far between in the Middarmark. Yet, few folk can survive this land on their own. As a result, the Rites of Hospitality have become
a sacred tradition upheld across the land—weary travelers can request succor at any steading or lord’s hall they happen across and expect shelter and sustenance, at least for a time.
Even some giants and trolls, hungry for news and diversion, have been known to grant hospitality.
So, it is an important part of the culture and the way in which humans and jotnar interact.
Here is an article with a little bit more of the context:
Orator is also used in Boasting, which is a ritualized vow to accomplish some task. This is also something that is often overlooked, but skalds once again excel in these situations. These types of things come up rarely, but when they do, it is, again, often in dire circumstances. So, the skald opens up possibilities and options that would not otherwise be on the table.
When in service of a boast’s pledge, here are the mechanical effects:
If successful, replace your Goal with a new Goal about accomplishing your boast. Until the boast is accomplished (and as long as you don’t change your Goal), all tests made in pursuit of the Goal are considered to be within your character’s Nature. If you accomplish your boast and live to tell the tale, gain +1D or +2D to Circles tests in the place where you made the boast based on the enormity of the task.