Coriantumr had devoted a great deal of time to studying “all the arts of war and all the cunning of the world” (Ether 13:16), yet he rejected the simple message of Ether, which would have brought him peace in a way that all his military skills could not.
Note the prophet Ether’s promise to Coriantumr in Ether 13:20–21 as well as its fulfillment (see Ether 15:1–3, 26–32; Omni 1:20–22).