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The guard's helmeted head slowly turns to face him. (Cue the "menacing" effect.) He 'speaks' in a dialect more akin to a structured growl than words.
Guard:
Ora rak passa Stilin, nus tura cilaf ora; orass wano bosna d'ires. Orass rak woka exrii stavnacc nus feresec.
(Translated from Vaiaelon to Standard:
"I don't speak Standard, but if you can understand me; we have a heavy cruiser in orbit. We won't hesitate to destroy your settlements if you disturb our operations.")