I'm not sure if this helps anyone re: original languages in Glorantha, but
the RoC Issaries write-up, p162, says that Issaries 'in his travels met the
daughter of Lhankor Mhy named Mother Language.'
AFAIK, the goddess Mother Language isn't mentioned anywhere else, so she
might just be a name without substance.
BTW, re: Tradetalk - might it not be called 'issary' or 'issarese'?
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Mikael Raaterova
[signature omitted on legal advice]