Re: [Discworld] Trolls and magic
I'd tend to use Physiomancy. They're living things; they just happen to have silicon-based biochemistry (comedy fantasy version). And Physiomancy deals with all manner of complex life processes, whereas Elementalism deals with the elementary building-blocks of the universe.
It's biology vs. physics, and a biologist will have a better idea about silicon-based life than a physicist will.
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