Rhefugi is the language spoken by Ambrose that was introduced when he was first encountered. It's a demonic language aka "The forbidden language." Though he speaks both English and Rhefugi, Rhefugi seems to be his stronger area. 

In the cases Rhefugi is spoken, a translator for the dear user:

Translate this as an example:

Slofzdoseaf pathdysy, qaq. Uai pof faq ifkylzsofk swez dofriory