Serval has lost the ability to speak. According to Black Rhino and White Rhino, it happened due to an illness that's been going around in the Waterfront Area...
The roaring sickness?
مرض الزمجرة؟
Brüllinfekt?
¿La enfermedad del rugido?
Le virus du groar-groar ?
La malattia del ruggito?
A doença do rugido?
Ревущую болезнь?