"How can anyone hold that much knowledge in their heads?"

"They're old."

Shatterstar, aka Mr. Tact. (Honestly Star firmly sticking to Terry as Surrogate Mother is my favorite.)

This log made me go on a little mind journey wherein Rictor becomes a botanist. It seems to suit his field of interest while being less on the nose than something like geology, although of course I'm sure Hordeculture would constantly "misremember" his degree and refer to him as a landscaper.