Fermented Godsblood (3.5e Equipment)
From D&D Wiki
Save: Will 25 will hold off stage two for 10 minutes
Initial Damage: The first stage of the poison runs through the creatures physical body, paralyzing them for 1d6 rounds.
Secondary Damage: The poison enters the creatures soul and destroys it, doing 1d4 constitution damage and 1d8 typeless damage every minute until the creature is dead or it has been 12 rounds.
Price: 15000 gp
Special: A creature killed by Void Godsblood is absorbed into the poison, lessening it's time between each hit. This poison ignores damage reduction and immunity to poison.