Venomous Draconic Breath

Your latent draconic heritage manifests through your amphibian physiology, allowing you to exhale toxic energy in a deadly burst.

You gain the following benefits:

• Venom Breath. You can use an action to exhale poisonous energy in either a 15-foot cone or a 30-foot line (5 feet wide) (your choice each time).
• Creatures in the area must make a Constitution saving throw
  (DC = 8 + your proficiency bonus + your Wisdom modifier).
• On a failed save, a creature takes:
• 2d6 poison damage + your Wisdom modifier, and is Poisoned for 1 minute ( repeat save at end of turns)
• On a successful save:
• The creature takes half damage and suffers no additional effect
• Toxic Synergy. If a creature is already affected by your grung poison (from skin or weapons), it has disadvantage on the saving throw against this breath.

Uses. You can use this feature a number of times equal to your proficiency bonus per long rest.