Recording for posterity the creation, evolution, and implementation of the Valthungian language
(also known as the Grey Tongue)
a modern-day descendant of Gothic.
Why do you keep the ending -s and other anachronisms? I think it would have developed much more than that during these 1,500 years...
Gytc is still very much a work in progress (and one which I haven't had much time to devote to recently), but my main theory behind keeping the -s is that PGmc -(a)z was rhotacised and/or then disappeared in the other Germanic languages, but Gothic devoiced the -z before it could be rhotacised. I don't think the IE -s ending is terribly anachronistic: It still shows up in plenty of languages like Greek; and in germanic it's still retained in Icelandic and Faroese as -r (again, rhotacised).