From Pathfinder Treasure Vault (Remastered), which isn't enabled.

False Hope

ITEM 17

ALCHEMICAL CONSUMABLE INJURY POISON VIRULENT

Price 2600 gp

Usage held in 2 hands

Bulk L

Category poison

Activate (manipulate)

This poison is an insidious distillation of the venom of the boomslang snake. It acts slowly and cyclically, giving its victim a false sense that the poison has failed to take hold or its effects have ended. The GM makes the target's saving throws in secret during any stage that has no effect.

Saving Throw DC 37 Fortitude (secret)

Maximum Duration 10 rounds

Stage 1 no effect (1 round)

Stage 2 10d8 poison damage (1 round)

Stage 3 no effect

Stage 4 12d8 poison damage (1 round)

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