[quote=@Skythikon]
As long as the dynamic doesn't lead to, well, death. XD

I did a bit of research on Old Norse (And it's evolution into the modern day Scandinavian languages) once, mainly to explore the idea of William the Bastard losing the battle of Hastings and the English language continuing to evolve based on it's Nordic and Germanic roots. Riveting stuff, but ultimately I chose Icelandic for my base since it's the closest we have to Old Norse in present times.
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As the only other Northern there and under a Southern Roof, Seothrunn will be fine.

I will probably go the same route then and use Icelandic. I know that they would probably have different dialects but that'll probably just happen naturally as we use different methods of it. It'll probably be safe to assume, though, that they can understand each other despite using different wording.