Cognitio, the "mind" aspect, is composed of Spiritus and Ignis. (Before 4.2.2, it was Spiritus+Terra.) It is distilled most readily from paper (which is a perfect source), but also found in zombie brains, and can be centrifuged from Humanus. It is used for a few craftings including the Brain in a Jar, and if it becomes surplus, can be centrifuged for Spiritus.

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