The gas spore appeared in the Tome of Horrors (2002) from Necromancer Games.
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Clark Peterson and his old friend Bill Webb formed Necromancer Games in the spring of 2000 to publish role-playing materials using the impending d20 license; on August 10, 2000, the same day Wizards of the Coast was to release the new Player's Handbook at GenCon 33, Peterson and Webb published a free PDF adventure called The Wizard's Amulet just a few minutes after midnight that same day.