Lastly, Devastating Wounds is an unreliable, but perhaps the most threatening, option against an army composed of few models. Every critical wound rolled is one you can’t take a save against, relying instead on your Feel No Pain 5+ versus mortal wounds, meaning that your statuesque demi-gods may rapidly find themselves in trouble. Some potent deliverers of this are World Eaters and Chaos Daemons.
World Eaters require a bit of luck to be blessed with Decapitating Strikes, from the Blessings of Khorne, but it is possible for their entire army to have Devastating Wounds on their melee attacks against Infantry units, making units like Eightbound or large units of Khorne Berzerkers capable of pulling down unfortunate Custodians should they manage to roll a few lucky 6s.
Chaos Daemons are also one to be wary of, such as Skulltaker leading a band of merry Bloodletters. He provides Devastating Wounds to their melee attacks, which can be supplemented by other units, such as a Rendmaster’s Blood Throne ability, to improve their S, AP and D characteristics by 1 for each assisting Rendmaster, before he himself strikes.