Ground Thassil Root
Level 5 Poison

This poison is a flavorless, blue powder.

Poison        250 gp
Attack: +8 vs. Fortitude; slowed (save ends).
First Failed Saving Throw: The target is immobilized instead of slowed (save ends).
Second Failed Saving Throw: The target is unconscious for 1d4 hours.
Special: Thassil root can be delivered only by way of food or drink. It makes its first attack 2d6 minutes after its victim consumes it. All saving throws against this poison are made with a -2 penalty.

Published in Dungeon Master's Guide, page(s) 51.