"Spell of the Spider" was Chapter 16 in Tom Paris' The Adventures of Captain Proton holonovel.

It depicted Queen Arachnia sending Doctor Chaotica a vial of irresistible pheromones, which caused him to fall under her spell whenever he smelled them. The vial was situated on a small pedestal next to Chaotica's throne. (VOY: "Bride of Chaotica!")