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Is there one? I know there are some decent one slotters, but anything I won't be ressing every 3 minutes?
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Sadly, if you're hunting in particularly dangerous places with multiple monsters (or even single monsters if you aren't a peace tamer), then I can't really think of any one slotter that survives decently. Closest thing would be a Gaman, and even that doesn't far that well against tougher monsters once it's targetted, IMHO.
I just use that one slot for an ethereal or for Nature's Fury (spellweaving spell. Any human can cast it at 0 skill) in dangerous places.
In non dangerous places (or single monsters you can control with peacemaking), I'd use a giant ice worm or gamon.