Fangs of the Auroboros

General Feat (Prerequisite: Level 4+)

Increase your Strength or Dexterity score by 1, to a maximum of 20.

Once per long rest, you can use your bonus action to summon a spectral snake that coils around you for 1 minute. While this is active, once per turn your attack gains the Poison Spray spell attached to it.

The snake extends its head towards your weapon/arms and projects a puff of noxious gas that coalesces. On a succesful hit the creature must succeed on a Constitution saving throw or take 1d12 poison damage.

This damage increases by 1d12 when you reach 5th level (2d12), 11th level (3d12), and 17th level (4d12).