Viper

Summons a companion with 5 Health. And a movement speed of 5 ft. the Viper coils around one's arm. the player may make an attack as a bonus action +dex to hit 1d6+ dex on hit.

Companion rules:

The Companion occupies the same area as the player it is connected to unless the player orders it to move somewhere or attach to another player. players can only have one active companion. companions can only be 25 ft from their owner or they don't work. they can go ahead of the player but they can't signal Danger.