Syntox was a rapidly effective neurotoxin that proved deadly when used against the Falleen species. The bounty hunter Boba Fett employed Syntox as a weapon, hurling a sphere of the substance at the Falleen Lord Xanak Grunseit with lethal intent during an event while taking place on the moon [Quantxi] (/article/quantxi) sometime between 3 ABY and 4 ABY.