Baron of Hell/Doom Eternal

Codex Description: ''The Fireborne Barons have evolved, descendant clan of the Baron hellbreed, and are indiginous to the caustic, scorched hellscapes bordering the Burning Abyss. A landscape of cragged spires forged from unbreakable blackstone, tempered by the crashing waves of magmatic tide, these sulfuric planes of Hell have long served as banishing grounds - a place of exodus to which the damned are sentenced as their final destination. The Fireborne Barons have evolved in this environment, sustaining themselves on the remnants of the damned, growing obsidian carapaces and in time becoming infused with the very incendiary matter of Hell itself.''

The Baron of Hell returns in Doom Eternal, however its color scheme has been changed from red and brown to grey. It has also been changed design-wise with a magma effect around parts of its body. It most likely functions the same as its Doom (2016) counterpart, but is much stronger and durable as it was able to withstand one BFG shot (much like it's classic counterpart and unlike it's 2016 counterpart) and  is completely immune to the chainsaw.