You see a lonely Snake
Notes
Part of the Ferumbras' Ascendant Quest.
Abilities
Melee (?)Damage Taken From Elements
Physical 
Death 
Holy 
Ice
Fire
Energy
Earth
Behaviour
Faster then a regular snake
Strategy
Don't kill it. It needs to be lured to a location to complete the quest. See the Ferumbras' Ascension Quest for details. Once killed it can be respawned by pulling the nearby switch again.