Thunder Fart

You let go of your inner rumbling, releasing a massive wave of poisonous gas from your bum, every creature within the 15 foot cone behind you must make a Constitution saving throw. On a failed save, the creature takes (2d8) thunder damage and falls Unconscious from the smell for 1 turn. On a successful save, the creature takes half damage and doesn't fall unconscious.

If there is any fire within the 15 foot cone, it will ignite and fill the cone with fire, making the creatures also have to make a Dexterity saving throw or take an additional 2d6 fire damage.

Lastly, if there are any tiny creatures/objects in range, they get pushed back by 5 foot.

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