Via Plutonica: Mandrake of Oxford will be shortly publishing Carroll's recent work, The Octavo: A Sorcerer-Scientist's Grimoire.
I was most interested in this somewhat amusing sample that Psyche nabbed:
Every universe potentially has its own Supreme Grimoire containing the spells which define its reality and the magic which you can perform within that reality. In this Octavo we have assembled scattered secrets for a Supreme Grimoire for Roundworld, the universe in which you’re standing.It's not my fault. You cannot blame me for this. And, fuck it. I'll never be rid of Pete, so I might as well give up and start calling him Doctor Strange out of amusement.
To this end we have taken some inspiration from Pratchett’s Discworld, and a lot from Theoretical Physics and Practical Chaos Magic.