Quote Originally Posted by Scylfing View Post
Oh now you're just being obtuse.

The point was to have the PCs deafen themselves to block sound-based attacks/social combat while still having a way to silently communicate with each other when they go up against Mr. J.
Dominate Person doesn't require anything sound-based, and that's Mr. J's most likely first tactic on anything that looks like it can cause massive amounts of physical damage but doesn't look too bright.

That's, of course, assuming that they ever get to meet Joker face to face. Considering his hit-and-run tactics, that's not too likely until the end of the campaign.