Vipers are not especially quick when walking, but can perform a high-speed rolling attack. The player's first encounter with Vipers is in the Mammoth Graveyard, where four Vipers attack with the Viper Commander. In the Volcano, Vipers are common normal enemies.
Vipers have quite a few hit points, but will also reward players with plenty of experience and Talons. It may be best to level up with Vipers in the rooms south of the main lava chamber, where there is more space to maneuver.