Ment
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In general, to avoid daytime reveals from bored investigators, we need to actively introduce notes and note-based warfare. Something like each peaceful role having 2-3 notes per game, with each note containing information about 1-2 nights, no more. The Mafia has the right to write 2-3 notes per night. The result is a war of genuine notes against fake ones, and their analysis during the day. This is much better than a competition of who can reveal better.
If we go back to Vesper, her being "under my responsibility" was quite enough, for example.