During Jehoram's rule, Edom rebelled against Judah's power and appointed its own king.
Jehoram, along with all his chariots, crossed over to Zair. The Edomites, who had surrounded him, attacked at night, defeating him and his chariot officers.
References for 2 Chronicles 21:9
So Edom has been independent of Judah to this day. Libnah rebelled against Jehoram's rule at the same time because he had abandoned the LORD, the God of his ancestors.
As if that wasn't enough, Jehoram constructed shrines throughout Judah's highlands, encouraged Jerusalem's citizens to be unfaithful, and led Judah astray.
A letter from the prophet Elijah came to Jehoram that read, "This is what the LORD, the God of your ancestor David, says: Because you haven't walked in the ways of your father Jehoshaphat or the ways of Judah's King Asa,
but have walked in the ways of Israel's kings and have encouraged Judah and Jerusalem's citizens to be unfaithful, just as the house of Ahab did, and because you have even murdered your own brothers, your father's family, who were better than you,
the LORD will now strike your family, your children, your wives, and all your possessions with a heavy blow.
You yourself will become deathly ill with a chronic disease that will cause your intestines to fall out."