Gladiator

The gladiator is an armored Hell knight- or baron-like enemy that appears in Doom Eternal. It is a boss exclusive to the Sentinel Prime level, and is the only major encounter in that mission. It carries a large shield and attacks with a or  weapon, and is fought in two phases. It resembles the Hell nobles of the original games more strongly than their Doom (2016) or Doom Eternal counterparts, though it is distinguished by the presence of a metal eye patch. The gladiator was momentarily shown in the second trailer released on.

Tactical analysis
In the first phase of the fight, the gladiator moves slowly and stays behind its shield. When the shield's eyes flash green the gladiator will attack with its flail, but when the shield's eyes blink then it may fire a projectile which the player can dodge with a sideways dash. The player should fire their weapon when the shield's eyes flash green and the gladiator attacks; hitting the gladiator will cause it to stagger, allowing the player to hurt it by pressing the glory kill button. After the gladiator has taken several hits, the shield will be destroyed.

In the second phase the gladiator becomes faster and more aggressive, replacing its destroyed shield with a second flail; however, it can now be attacked and damaged at any time. One of the gladiator's attacks is to launch the two flails so that the player is trapped between the chains; it then fires a series of energy waves which the player must jump over or step between, before charging towards the player. Once the gladiator's health is depleted it can be finished off with a glory kill.

Lore
Following the fall of Sentinel Prime to the forces of Hell, the Hell priests called for the repurposing of the once-venerable Coliseum. Once meant as a place of trial by combat where prisoners of the Argenta were given a chance to prove their worth as soldiers, it has since become a place of blood sport to entertain the debauched remnants of the Argenta. By the order of the Hell priests, the ancient demon called the Gladiator was sent to the Coliseum so it might act as their executioner.

Wielding an accursed shield containing the soul of its former master, the Gladiator has never been defeated. It is infamous for the many lives it has taken.