Much of the purpose of obscenity is to offend, thus why many still avoid usage around children. And I prefer phraseology in context like 'the King's Wiper', 'a quad', and 'Shave my back, and call me an Elf' to something out of our own environs.
I do take some exception to this argument, however.
Firstly, as I explained in the other thread, swearing done solely for the purpose to offend represents only one part of why we swear. There are five types of swearing by purpose. Abusive swearing - that is, swearing with the intent to offend someone and hurt their feelings - is only a fraction of the picture. On the other end of the spectrum is idomatic swearing, which has the opposite purpose; it's swearing to demonstrate closeness, comfort, and a lack of formality. Swearing to represent friendship.
Secondly, a two of the examples you give exist only to appease censors and moral guardians. Many, many curse words, including the f and s words, date back over fifteen hundred years; they were very much in use in the middle ages where fantasy settings such as dragon age are inspired by. The only reason swearing in these settings may seem odd is because for so long these settings have been restricted to children's stories.