CAIN'S POWERS
Since I didn't put them on the carrd so you guys don't get slapped in the face with too much text, let's compile a comprehensible list in shape of a headcanon post.
Demonic Possession: like all demons, he could leave his body and possess another. In all of his time on earth, he never did that and most likely won't do it ever. Because he detests that practice and his own body is practically invincible anyway.
Immunity: he literally can't get sick or affected by any regular weaponry, not even angelic powers faze him. They just rearrange the hair on his head for a second like a soft breeze. Only archangels can truly harm him. Immunity is fundamental to the immortality denying him death. It doesn't mean he can't feel pain.
Invulnerability: you can stab him, it just won't do anything nor leave any scars. This gift involuntarily includes regeneration, which the wiki states as its own power for some reason.
Super Agility / Strength / Senses: something almost all demons have in common. So he'd recognize a demon or angel through their vessel, no bullshitting that dude with masks. He knows you're coming when you're not within sight. In combat or other chaotic situations, he never loses orientation or focus, because it's what he was made for.
Telekinesis: another power most demons share. Self-explanatory.
Teleportation / Apporting: also self-explanatory. He can teleport from one place to another and take others with him, or send them away without joining. As he did when touching Dean and Crowley's shoulders and the next moment they were outside of the house.
Terrakinesis: if he wants to be extra, his arrival might cause earthquakes. He did that during his time surrendering to the mark, because he enjoyed fucking with his targets.
Weather Manipulation: he can also choose to let a wind-blow herald his arrival, or cause a thunderstorm. When in canon, Dean stabbed him with the Blade, a clap of thunder sounded above.
Demonic Smiting: an ability unique to him. While usually smiting is a power reserved for angels, he's the only demon who shares this attribute with them.
Biokinesis: a simple gesture sufficed to make Crowley lose his voice for as long as Cain wanted him to shut up. He also controlled his own blood flow when Dean rammed the knife into his chest, not letting a drop run free. And he doesn't show his white demonic eyes, normally. So, anyway, he can literally control your body if he wants to.
Electrokinesis: at will, he might cause disturbance to electricity. Flickering lights or lights going out, all that neat stuff. But this means he could kickstart a car when its battery died without the use of tools, or shut down your computer from across the table if you don't listen to him while he talks to you. The lights might also flicker when he, you know... :)
Power-Negation: not only did he prevent Crowley from teleporting away, he also didn't lose all of his abilities while in the devil's trap. Which usually strips demons of their powers. It also wouldn't hold him for long. So if you're a supernatural being, he can make your powers just not work around him. But where's the fun in that?
Master Hand-To-Hand-Combat: naturally, he's an extraordinarily skilled fighter, being the first knight of hell to train an entire order of knights and with 6000+ years of life experience under his belt.
WEAKNESSES
Witchcraft: to an extent. Rowena's illusion spell successfully tricked him into thinking the boy he was out to kill stood in front of him. Until he went stab-happy and the kid poofed in swathes of purple mist.
Devil's Trap / Demon Cuffs: they might not work for long, but they do work for a while. And most of his powers with exception of telekinesis won't serve him during that time. So make sure to cuff him, then he can't do anything for like 30 minutes.
Poisons: won't harm him, but he might get stoned or something for some time, maybe even lose focus/orientation.
The Divine: meaning the big guy himself, the devil and other archangels. They can kill him. But since his punishment from above is to live on forever, they won't give him that peace. They can get on his nerves, though, and he can not overpower them.








