While the 400 prophets in the narrative are not prophets of Ba'al, but speak in the name of God, they are nonetheless false prophets. The method in which God reveals himself to prophets, other than Moshe, does not allow two prophets to prophecy in the same words. At the request of Yehoshafat, the king of Yehuda who enthusiastically embraces unity with the Northern kingdom, a solitary true prophet is brought. He brings a message of Ahav's demise and for this he is punished. Despite his disguise, Ahav is mortally wounded in battle, but remains in the battleground, sacrificing his life, in order to give moral support to his soldiers. 

Ahav is a wavering personality who lacks a solid backbone and is easily influenced. He can be swayed towards Ba'al and can be shocked to veer closer to God worship. It is this lack of personal resilience and consistency that leaves him so susceptible to wide alterations in his religious orientation. The damage that he inflicted upon both the nation and the unfortunate individuals who met their death as a result of his actions means that he is one of the worst kings in the history of the Northern kingdom.

 

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion