Surprisingly hefty copper colored dagger.

Physical notes.
-Heavier than it looks, handle possibly solid copper, one and a half hand long.
-Blade dark silver, doesn't reflect light. lower arm length, about 1foot/30cm. Thin edge with a sturdy spine, double edged blade with a sharp point.
-Pummel dark copper color in the shape of a Viper, eyes polished rubies with gold highlights with rubies. Heavy and sturdy for punching.
-Handle appears to be wrapped in leather, slightly oval to aid with edge alignment.

Notes in use.
-Tin edge aids in cutting, sharp point for stabbing.
-Sturdy weight, but surprisingly light in use, but opponent feels the weight.

Magical special feature.
User who understands the magic and somehow has contacted the spirit inside it can use its special feature. Mainly transforming into a snake.

-The dagger can elongate, he blade becomes round to form the tail of the snake, keeping its colors and approximate weight.
It seems to follow physical rules, its weight is always constant and so is its volume. Meaning the longer it becomes the thinner it becomes, but sfficient users can order it to become hollow so it can grow thicker without sacrificing length.

-It can share its senses with the user, smell, heat vision, normal vision and hearing. Excellent for spying and scouting.
-Other uses. climbing, using as rope, either for climbing themselves or tying other targets. Does not have its own poison, but can bite and inject poisons given by the user
-Appears intelligent, but obeys loyally.
-Strong enough to crush bones and strangle opponents