The test to become a poison master was not that different from the tests the Alchemy school provided him with. He had to first spend some time recognizing the ingredient to see how capable he was, and then he had to go into making poisons.
There were several types of poisons with their own unique traits. Some poisons were lethal, some were not. Some were instant, and some took a long time.
Not all poisons were the same, but most could be treated with one or two specific antidote pills. However, when it came to specific poisons designed for a specific purpose, those were the ones that were the hardest to cure.
Alex made as many poisons as he knew from his various lessons. He had not only learned about poisons back in the Luminance Empire, taught by the Princess Xumei of the Royal Wei family, but also from the Nether Poison sect, who had provided him some things in secret for saving them from the mad immortal.