Toxic

You release a magical aura of toxic bile. The bile does not do anything to other creatures around you. You choose a creature that you can see within 25 ft of you. That creature must succeed on a Constitution saving throw or take 1 + you Constitution modifier poison damage at the start of each of its turns for 2 rounds, with the poison damage increasing by 1 for each of the creature's turns that elapse, as long as you maintain concentration.