Epic monsters on hard and elite are now resistant against death if their CR is above 20. This ward is called “hard to kill” and acts as a death ward until the targets hps drops below 50% which removes the ward. The ward doesn’t restore after the monster heals.
From the June 15th release notes. Wasn't this concept supposed to have been killed with the Wail nerf? Is this just a typo, or are we getting this in addition to the nerf?