If a Shedite inhabits someone for less than a full day without corrupting him, does it get dissonance?

On any 24 hour period where a Shedite has possessed a host, it has to corrupt someone. So if a Shedite spent a few months in Hell, it doesn't get dissonance (no hosts, no need for corruption). It then pops up to Earth and inhabits someone for a few minutes.

That's when the clock starts ticking. (As a non-canon GM's option, you can require them to corrupt every host they inhabit even for a moment. More.

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