When Nico di Angelo gets mad at you, you better run and leave the country forever. Even though that won't stop him. His army will probably get there before you do. And when he finds you, he'll raise all hell and let it loose. And whatever powers you may have, not much can compete with literal hell. You can't escape death when it wants to find you. It will creep up on you and catch you in your sleep. His army is already dead; you can't kill it again. We can count ourselves lucky he never decided to join the dark side. No one would be safe. Escaping him is nearly impossible.
If Nico di Angelo gets mad at you, you better watch out.
If you hurt Will, you should be fucking terrified. Nico strongly believes Will Solace is too good for this world and he will protect him at all cost.
If you think Nico wouldn't strangle you with his bare hands for touching Will, you're dead wrong. Literally. Because he will.
As a child of Hades, his fatal flaw is holding grudges. Over time he's calmed down, but if you touch Will, nothing can stop him. He will get his revenge. No matter what.
He'll follow you to the end of the world and beyond, taking down everything that dares getting in his way. Destroying all you hold dear. Killing trees and flowers on his way. He'd set the world on fire if that's the only way to get to you. And if afterwards, his hands are tainted with blood, it would've been worth it. Revenge would've been worth it. Will would've been worth it.
And you may think his surname of angel doesn't suit him. It does. Because when he's fighting he's got all the glory of an angel, he shines like an angel and kills like an angel. Lucifer was an angel once, after all. Then thrown out of heaven, but an angel nonetheless. And that's what Nico is. An angel until you dare hurting Will. Then he doesn't care about heaven; he'll kill everyone that gets in the way.
If Nico di Angelo gets mad at you, you better watch out.
If you hurt Will, you should be fucking terrified.