Clockwork
A clockwork familiar runs on borrowed time, needing a minute's winding each day or it grinds to an unaware halt.
You need to keep your clockwork familiar wound, but the process isn't particularly onerous or time consuming. If you spend 1 minute winding up your clockwork familiar with a unique key only you can use, it can remain active for 24 hours, after which time it becomes unaware of its surroundings and can't act until it's wound again.
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