Geneforge/YMMV


 * And It Worked: In the first Geneforge
 * Game Breaker: In some games, the Vlish. They are cheap to create and cause both slow and poison status effects, making a sufficiently-leveled pack of them unbeatable even on higher difficulty levels.
 * Goddamn Bats: Enemy Vlish. They swarm and cause a variety of negative status effects.
 * Podlings in V have area-effect attacks that inflict negative status effects. And since different varieties inflict different effects, it can get very annoying very quickly.