It's actually worse than it first appears. It hasn't been brought up since season 1 but Bell is immune to charm and brainwashing magic and spells. Like not resistant but immune, so he can't be forced to do anything mentally, but this also means that he's alone if everyone around him are charmed. His skill Realis Phrase is that powerful but he likely doesn't even understand it himself, to him its just normal but for other people they are powerless before Gods, like others literally can't lie to Gods.
It's actually worse than it first appears. It hasn't been brought up since season 1 but Bell is immune to charm and brainwashing magic and spells. Like not resistant but immune, so he can't be forced to do anything mentally, but this also means that he's alone if everyone around him are charmed. His skill Realis Phrase is that powerful but he likely doesn't even understand it himself, to him its just normal but for other people they are powerless before Gods, like others literally can't lie to Gods.