I have my own Challenge related to Cyb-kun.
-ANGEL OF PANIC:
You are mortally afraid of the big bad C, and he likes to take that to his advantage, by doing some mischievous things every once in a while...
1) When you're on the level, he may make his voice heard, which scares you, making you weaker, and encourages his demon brethren, making them stronger. Thankfully, when possesed by panic, you can run faster.
2) Every once in a while, you hear thunderous mechanical steps similar to those Cyb-kun does when he walks. This makes you drop your current weapon in fear, which can turn REALLY nasty if you are being attacked by many, strong enemies.
3) The third thing he can do is SPAWN IN THE LEVEL YOU ARE after you destroy all the monsters in it, and he's invincible when he does so, mainly because you're so full of fear, you can't even aim at him, and obviously you can't shoot him. You can't take any items on the ground, either, as you can only think on running away. AND there's a chance you drop your weapon. ("You feel relatively safe... But what the... Run, marine, RUN!") Thankfully, you run A HELL LOT FASTER when he spawns.
But don't worry, I haven't abandoned you. As Cyb-kun feels that you being afraid of him will make you a lot easier opponent than the other marines that have dived into the base before you, he has deployed less monsters on each level, making you life theoretically easy. Until one of the three aforementioned things happens, at least.