Dialogicans, from Ultima Underworld II
The Avatar went to them in Ultima Underworld II, after first trying to talk with the Data Integrator had failed, and the Futurian had told the Avatar to talk to them. The Dialogicans were two extremely strange Talorids who weren't as formal as the others, and seemed to have great fun with throwing around word games and grammar.
As it was, their job became necessary because the Guardian's simple programming made communication between the different jobs more and more difficult, who simply didn't any longer think of it as necessary to use proper language (like the Data Integrator). To help with the problem they gave the Avatar a scroll prepared by the Futurian so that the Avatar would know what exactly to say to get the desired results.