1. They look the same as they do usually. There are no physical changes related to this prompt. The only changes will be up the players: do characters under the influence carry themselves differently? Do they have a glint in their eye?

2. The catacombs are strangely barren of psychic activity. On the surface, this may have happened to her, your example with the NPCs certainly can have happened. With the ghosts who frequent the radio waves, she could have written or drawn parts of the songs that they've communicated with. But in the catacombs? It's dead silent on the psychic radio waves. There's a feeling of pressure that drowns everything else out, a very heavy silence.