Disclaimer: I do not own anything Doom as it is owned by ID software. However, the demons in this codex of sorts are all created by me.
Name: Doom Stalker
Classification: Super Heavy Demon
Backstory: The Doom Stalkers are subspecies of a race of beast-like hunters, who are nowadays called the Doom Hunters. Like the Doom Hunters, they are known for being deadly combatants said to be silent killers by the Night Sentinels during the Age of Metal, alongside what would eventually become the Doom Hunters and the Doom Seekers. This is due in part to their ability to teleport short distances and being almost unnoticeable as they make little sound. They were supposedly made extinct like the Doom Hunters, however, the mummified remains of some Doom Stalkers were excavated by cultists under the Hell Priest Deag Grav in the arid deserts of Eurasia. Inspired by Deag Ranak, Deag Grav decided to try his own hand at resurrecting the silent but deadly Doom Stalkers from the dead. He managed to do so through the same process that the Doom Hunters' have been reconstructed and resurrected through in one of the bases that are run by his loyal cultists. The Doom Stalker itself has been armed with cybernetics, but their mind is still there, now wanting revenge against the Doom Slayer for killing them while being armed with weapons of an army but with stealthiness and swiftness that tops any master assassin. Though of course, the mind of the Doom Stalkers, like the other demons, seeks to satiate their violence but this time with their other brethren, those being the Doom Hunters and the Doom Seekers.
Description of the Demon: A typical Doom Stalker has gray skin and long spikes, though its eyes have been replaced with a red visor that covers its face. The Doom Stalker's legs have been replaced with cybernetic ones. Its right hand has been replaced with an acid gun, an energy blade is on its left hand, and when in combat, panels open up in its legs to reveal plasma cannons.
Combat Characteristics: The Doom Stalker is capable of teleporting short distances. The acid gun fires balls of acid that can stick to any surface and even on the ground with the acid said to be capable of melting a face in seconds. When an enemy gets close, the Doom Stalker would use its energy blade to cut its opponents to pieces. The Plasma Cannons are capable of firing at a quick pace.
The shield of the Doom Stalker can be downed by firing at it with plasma but before that, it makes the Super Heavy demon invisible to the naked eye, similarly to Spectres and Spectre Whiplashes. More importantly, the Doom Stalker doesn't make a lot of sounds whenever it attacks nor does it make sound whenever it walks, meaning it cannot be detected easily.
A/n: The Doom Slayer is basically, as the codex says, a subspecies of the Doom Hunter, though unlike it, this demon is a sneaky one which can catch its opponents off guard and kill them without them ever knowing.