Alexius writes his down. The ice spike is in English, the shield and antitoxin in Latin. "Ice spike takes a chunk of water, freezes and flings it, fast and sharp. I can't cast much more than a cupful but in theory it could scale up, I think. I have a bunch of common poisons memorized for the poison spell, it's not necessary but it does help and it's generically good to know what might kill you in the Scholomance. The library probably has books on different compounds or I could trade you some tutoring later. The way you work the knowledge in is to focus on the specific thing you want to neutralize when you're casting the spell, and it'll hone in on that particular molecule. If you don't do that it'll just use some combination of 'stuff that you don't want in your system' and known poisons the spell's already primed to look for." In fact, a number of those toxins are part of the Latin chant: finitum solanum, etc.