Beowulf (like most Scandinavian or Scandinavian-influenced writing around that time) basically has rap-battles in it. You want to put in modern slang and sweari

Beowulf (like most Scandinavian or Scandinavian-influenced writing around that time) basically has rap-battles in it. You want to put in modern slang and swearing and such, that's where I'd do it, personally. [EDIT] Those parts are also fucking boring in most translations, so would be the most-improved by such an approach.