Venomous Feystep

For the next minute, the toxic emerald-green mist of a Green-dragon's breath surrounds you. While you are surrounded by this mist, you can use a bonus action to dissolve into it and teleport up to 30 feet to an unoccupied space you can see, leaving a cloud of the vapors in your wake. After you teleport, all creatures in a 5-foot wide line between you and the space you left must make a Constitution saving throw. A creature takes 2d8 poison damage on a failed save, or half as much damage on a successful one. A creature which fails this save is also poisoned until the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage dealt by you teleporting increases by 1d8 for each slot level above 3rd.