Her caution is rewarded with another smile from the demon lord.
"Fragile? Far from it. This is the anchor point for the entire reality we live in. Do you really think humans were created by some higher power? Nobody could invent humans. In a time long past, the Astral and Infernal realms were nothing but seas of raw power. They were connected to this plane much more closely than they are today, and their energies permeated it. These energies could be used, giving rise to the individuals you call wizards, witches, sorcerers and so on. There is a saying, coined by a human: when you gaze long into an abyss, the abyss also gazes into you. So it was with magic. Humanity shaped the beings known as angels and demons. We were born from your minds, your hearts. The angels were created from the good, and we demons from the evil - or so they say. I personally think there's a mix in all of us. The angels have long since become prideful, thinking themselves above you. They closed the Astral and Infernal realms to human contact. Does that sound right to you? They are supposed to be the guiding light, and yet they shut themselves away. Meanwhile, I, a being of purest evil, am here on Earth, and yet I'm not running around killing and violating. Something there is off."
He walks over to the machine that generated the portal and lays a hand on it.
"This is the sort of thing I'm here for. New technology, new opportunities. All of humanity united, pushing towards the future, rather than the incessant squabbling you currently undergo. A new age where humans rule the stars above as well as the land below. Leaders focused on the common good rather than pleasing the rich and lining their own pockets. An end to the destruction of your homeworld, and a beginning to harmony with it. And, of course, a place for me here. I hate the Infernal Realm. If you think human wars are bad, you should see the incessant battling on the War Fields. And then there's the Sins sitting in their palaces - well, except Wrath. He's normally down on the Fields, but the rest of them just laze around fulfilling their own nature. Sloth just sleeps all the time. Greed hoards and counts and steals. Gluttony eats constantly. Envy plots and plans how to take what doesn't belong to him. Pride is forever trying to prove himself superior, and Lust just goes around shagging everything that doesn't stay far enough away not to be captivated by his aura. They're all immensely powerful, but I despair to ever get them to focus on something important. Below them are the Demon Lords, taking on at least some of their master's power. Most of them want to kill all the humans and take Earth for themselves. They're the worst ones - at least the Sins mostly stay out of whatever's going on."
Sighing in frustration, he rubs a hand across his face.
"I can't stand it. That's why I'm here - to get something done and find a place where I can fit. Perhaps it might not make sense, looking for that among humans, but I have a better chance here than in the Infernal Realm. As for the Astral Realm, I really don't want to get into a fight with the Archangels. So here I am. Offering humanity the hand of friendship and the chance to see what a Demon Lord's power could do for you."