system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel][XMen] What really is Apocalypse's thing?

I'm not a real Marvel Fan, I haven't read the comics. So what I can see from the X-Men: Apocalypse Movie, he can amplify a mutant's existing powers and he can steal powers via the Pyramid device (which he acquired regeneration). Things he has that other has is telekinesis, matter manipulation, Professor X like powers and super strength.

Aside from the last items, the two first ones seem to be the only things that are unique to him. Am I correct?
gpt
In the comics, Apocalypse's main power is high-level shapeshifting/control over his own body, which grants him near-immortality, superhuman strength, invulnerability, etc. He enhances these powers with vast amounts of Celestial technology (the ancient space-gods glimpsed briefly in the Guardians of the Galaxy movies), which gives him basically any other power he might need, and the ability to enhance other mutants.

It also upgrades his natural near-immortality into effective actual immortality, although he does need to spend prolonged periods in hibernation in order to get the full effects - although unlike in the movie, he's been awake at numerous points in history between ancient Egypt and the modern age, recruiting servants during the Roman era and the US Civil War, and having a vicious feud with Dracula in the late 19th century.

He likes to claim to be the First Mutant, but this is hyperbole; there's at least one mutant (Selene) who is older than him, and given the odds of the first two mutants being effectively immortal, the chances are there were numerous others who lived and died long before Egypt was a thing.