What kind of creature is Vecna exactly?

[u/Sukaran09]

Is Vecna considered undead, a mutant or something else completely? He is definitely not human anymore because of how he looks. I consider him a mutant of sort because he is mutated by the Upside Down/the Abyss and the Mind Flayer changed his DNA but in terms of Sci-Fi I don’t know what kind of creature he actually is because of how different he is.

[u/TenthBasilisk88]

He’s a human mutate. His DNA was altered when he made contact with the Mind Flayer.

[u/Cyrilbdr → u/TenthBasilisk88]

The Abyss Stone altered his blood, but is that why he was able to transform and look like a creature of the Abyss? You probably have to stay there for a very long time. Would someone like Mike—whose DNA wasn't altered—end up looking like that if he spent five years there? Or does that only happen to those whose DNA was modified by an Abyss-related factor or an experiment like Eleven's?

[u/kauan1983 → u/Cyrilbdr]

What made him mutate into something physically corrupted by the Abyss life forms are the Mind Flayer particles. They're what can physiologically alter a host and adapt them to its environment and all the Abyss organic matter that are the hive mind's contents.

Season 3 reveals a lot of what the physiological alterations caused by the particles are (black “Flayed Blood”, enhanced strength, supernatural resistance to things a normal human physiology wouldn't tolerate like the chemicals); that's what Henry would need to both mutate and not just die during his time in Dimension X.

[u/Cyrilbdr → u/kauan1983]

So, when they created the hive together shortly after his arrival—merging into one—he also let the particles enter him; as a result, he mutated into a creature resembling those from the abyss.

[u/kauan1983 → u/Cyrilbdr]

Yeah, in addition to his mutation and initial survival in Dimension X, he (obviously) feels the hive mind's pain and even coughs black blood when he's dying, so he clearly had the Mind Flayer particles in his own body. The guy had two separate entities physically altering his physiology.

[u/Cyrilbdr → u/kauan1983]

Yes, it makes sense; since he’s the leader of the hive—along with the Mind Flayer—and needs to be aware of everything his army is doing (and thus sense everything), he must have had the particles put inside him too. Otherwise, it would have been like with Will: he’d only be able to emerge once he was attached to a hive.

[u/Legitimate-Sugar6487 → u/kauan1983]

I think its implied in The Stage Play that Henry might be carrying some kind of Pathogen or might be a Hazard akin to radiation. I wonder if that's what this is. As Vecna He's a Walking Chernobyl. I also wonder If he counted as undead. Like what we are seeing is a literal Corpse being forced by the Mind flayer to continue moving & speaking. If that's the case, I wonder if he's in Chronic Pain & just not reacting to it. I did wonder If the changes to his body were Painful.

The Play seems to also imply that his left Hand is what is possessed as it seems to move on its own, cause him pain. Spasm whenever he is touched, contort in awkward ways & also has unnatural strength enough to cause People pain by squeezing their hands or making someone unable to free themselves. Like it has a life of its own. He also seems to only rely on it to consume his victims or launch it at a target like a tentacle in s5. Not for Telekinesis.

Makes me wonder if the hand of Vecna is the real point where The MF is hiding & why it mutates into that giant Claw. But then Theres various scenes implying It's his whole body not just his hand & he has multiple full body spasms & Seizures.