There is no Common language in Isla. Each of the three major human cultures has there own language. In Canon they speak what is known as the Chant, the spoken tongue of the sacred writings of the Divine Plan. In Ri Xi they speak Ri, a language similar in structure to Latin. Grittish is spoken by the barbarian tribes and the people of Valin’s Glory. Dwarves, elves, gnomes, dragonborn, and drow have their own racial tongues. Orcs speak Grittish.