Eisen's Guiding Spark

As an action, the caster extends their arm forward and begins to draw back with their other arm, slowly forming an arc of lightning in the form of a bow. A bolt forms, and is launched towards the targeted creature.

If the creature you are targeting is wet and they fail the dexterity saving throw, they become stunned until your next turn. 

If the creature you are targeting is dry and they fail the dexterity saving throw, they are set ablaze and they begin to take 1d4 fire damage at the beginning of their turns until they spend an action to put themselves out. 

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d6 for each slot level above 4th.