I find that the only use for poisonous mushrooms is to cook them with oil so you can sell them for a little more than just plain poisonous mushrooms.
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"Dark Matter is the power of hatred... it brings out negative emotions, and amplifies them. But my desire to fight you was mine alone. Fighting with you... it was fun! Fight, Django... fight on until the end... everything else can wait... never give up! Because that indomitable spirit of yours... is your greatest weapon!" -Sabata; Boktai 3 - Sabata's Counterattack