On the night Roland signed the pardon, Flagg went to his gloomy basement laboratory. There he donned a heavy glove and took a deathwatch spider from a cage where he had kept her for twenty years, feeding her newborn baby mice. Each of the mice he fed the spider was poisoned and dying; Flagg did this to increase the potency of spider’s own poison, which was already potent beyond belief. The spider was blood red and as big as a rat. Her bloated body quivered with venom; venom dripped from her stinger in clear drops that burned smoking holes in the top of Flagg’s worktable.
Stephen King, The Eyes of the Dragon (22)