Vian's Vaporous Viper

As an action on your turn, you summon a huge snake made of vapor. As a bonus action on your turn, you can command the serpent to take an action and move. It uses the statistics of a giant constrictor snake, with the following changes:

. It has resistance to cold damage

. Its attacks deal cold damage

At Higher Levels. When you cast this spell with a spell slot of 4th level or higher, the snake gains a Hit Die for each spell slot above 3rd.