The Vale of Eréch
Kreel was a Dragonborn Soldier (MM 86) that could breathe lightning.
Kreel was first encountered during the quest to find Raven. When the players arrived at the Feathered Crossing, they found Kreel attempting to barter a transfer of goods with the tavern’s barkeep.
Kreel was dispatched along with the barkeep and two Iron Defenders. A search of his person (and his wagon outside) found only normal adventuring gear.