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...
It's a mysterious illness that's 
been going around in this area.
إنّه مرض غامض كان ينتشر في هذه المنطِقة
Eine mysteröse Krankheit,
die hier momentan im Umlauf ist.
Es una enfermedad misteriosa
que parece afectar el área.
Une étrange épidémie
qui sévit dans les environs.
È una malattia misteriosa 
che sta girando in quest'area.
É uma doença misteriosa que
anda acontecendo por essa área.
Загадочная болезнь,
бушующая в нашем регионе.