Mr. Mercer was clearly drawing a lot from classical Greek philosophy for Kryn Dynasty terminology; dunamancy, anamnesis. Typhros though has stumped me. Clearly Greek but I haven't been able to figure out a root... until now.

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It's just soul imprints guys. Souls got ran through the printer too many times.

ERROR MESSAGE: SOUL OUT OF INK (SORRY ABOUT YOUR SANITY)

More seriously though, I wonder if it's from (or combined with) the Greek týfos, from the Ancient Greek τῦφος (tûphos), defined below, which also appears in Latin as typhus and from there the disease name "typhus fever":

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Have typhros, brb turning into vapor and getting up to nonsense

But it's that mysterious R that prevents the clear match in both cases. I thought I'd be clever and swap a consonant for a near cousin sound (in this case voiceless->voiced for T->D) and found this instead:

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As you go through each life, your chances of becoming a small chair increase.