The immune system is the way in which a creatures' biochemistry reacts to infections and disease.

Different species can react to the same toxin in different ways - for example, if a C3 Grendel is injected with a histamine it will quickly react by producing anti-histamine. By contrast, the C3 Ettin has a poor immune system, if it is injected with a histamine it will take a long time to remove the histamine from its body.

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