Ember Belly

As an action, you may swallow a flask of oil, which the spell consumes. During the duration of the spell, you may choose to exhale the oil, igniting it as you expel it from your body.

All creatures in a 20-foot line must make a Dexterity saving throw or take 2D10 fire damage or half as much on a successful roll.

It's an action to use the oil in this way and once you have the spell ends.

FOR OBOJIMA