Pit viper

The pit viper is a mutant species of giant snakes. Their venom is known for its hallucinogenic effects in those who do not die from it. The pit vipers are worshipped by the raider-tribe known as the Vipers.

Appearances
The pit vipers don't appear in any Fallout games. They were to be featured in a location cut from Fallout. The Vipers were formerly known to dip their melee weapons in pit viper venom.