Volcanic Eruption

You pull in all the magic in the air around you. Your body begins to emanate heat beyond living temperatures. After charging up you seem to self destruct with the power of a small volcano in all directions.

The caster becomes immobile during the cast. On the second turn after the user began charging he spell, it will automatically cast. The sorcerer cannot take any other actions during the turn it casts.

If a unit ends its turn within 5 ft of the caster during the charge they take 1d8 fire damage. All units in the radius take 3d8 Fire damage, if the unit is on the edge of the range they can make a Dex saving throw with a DC of 15 for half damage.