Mormon 4:11

And it is impossible for the tongue to describe, or for man to write a perfect description of the horrible scene of the blood and carnage which was among the people, both of the Nephites and of the Lamanites; and every heart was hardened, so that they delighted in the shedding of blood continually.

No one can describe or write a full picture of the terrible killing that happened among the people. Both the Nephites and the Lamanites had hard hearts. They loved to kill.

What happened next is too horrible to fully describe. The bloodshed and carnage among both peoples—Nephites and Lamanites—was beyond words. Every heart had hardened. They took pleasure in killing, constantly.