Diavolo then walked in and to the Mafia guy's office with other demons watching him and following him into the office where he saw the Mafia Demon boss sitting at his desk.

Mafia Boss : Lord Diavolo what brings you Here?"

Diavolo : cut the act. I know exactly what you did to Mammon and what you have been doing to him for months "

Mafia Boss : why come all the way down here for that? Instead of sending..... he's your little mistress isn't he? Dating your ex fiance brother how scandalous "

Diavolo : ......."

Mafia Boss : so it's true?"

Diavolo : ..... either way what you been doing to him I will not allow you to get away with. You nearly killed him!! "

Mafia Boss : he actually managed to survive? Good on him I guess. So now I'll still get my money "

Diavolo : you will not be getting anything! Especially from him or anyone else!"

Mafia Boss : I'm an important Demon and ally of yours and I know what will happen if your secret gets out. Your in no position to threaten m!?"

Diavolo quickly ended up behind the guy and grabbed the back of his head and slammed it hard against the desk. cracking the desk and making the guy face bleed  and just held his face against the desk.

The other demons had no idea what to do so stood back as Diavolo leaned down next to the guy's face and said in the most spine chilling cold dead demonic tone

Diavolo : Do you forget where you stand against me? Your below me. I am the prince of Devildom. And you are just a pathetic little demon you have absolutely no power once so ever.
And anything you do have I can take if I deem necessary.

Now you hurt someone I care deeply about. Put them through pain and torture they didn't need to face. Nearly killed them over some debts.

Well your never going to see that money because you are done and this goes as a message for everyone. I will not tolerate anyone hurting the ones I care about. And that goes not just for Mammon but for everyone and everyone he cares about also.

If I wanted to I could make you disappear and lock you up for an infinite amount of time. But since I'm so kind I won't do that for now. Do I make myself clear?"

Diavolo then lifted the guy's head and the guy didn't say anything but spit out blood and say.

Mafia Boss : ......g....get....him...."

Diavolo : I wasn't coming here to fight but if that's what you wish I'll try and hold back. But no promis-!?

Diavolo was immediately attack.

Later at the castle all of Mammon's brothers got there and went to the room Mammon was in.

And as soon as they show up Mammon tried sitting up but Barbatos stop him and said.

Barbatos : no you need to rest"

Asmo : Mammon....."

Asmo looked extremely worried and Mammon just looked at him and knew that he had to tell the truth.

Lucifer : what happened!?"

Mammon : ....the debts got bad....I tried so hard to handle it on my own but....if I miss a payment or were late or something....I would get beat up for it.....by a lot of demons I owed money to....especially this Mafia guy.... something he would just torture me because he could......he tried to kill me tonight....."

Lucifer : ...... Mammon...why didn't you just say something?...."

Mammon : I didn't want you to be mad at me.....I didn't want them to hurt you guys.... I'm such a failure at everything I just.... wanted to work hard and fix my own problem....."

Belphie : can we murder them?"

Asmo : yes that sounds better than what I suggested"

Lucifer : they will pay for this. All of them will"

Mammon : I'm sorry...."

Lucifer : Don't be. You didn't do anything wrong"

Beel : where is Diavolo?"

Barbatos : he went to talk to the guards about capturing these demons Mammon told us after he showed up here"

Mammon : I...I didn't know where to go to get help.... didn't want you guys to know but....you do now...."

Suddenly Barbatos heard someone so he left to see if it was Diavolo.

Once downstairs he saw Diavolo walk in fists bloody and bruised and looked about beat up with blood on him.

Barbatos : what did you do?"

Diavolo : I talk with them?"

Barbatos : and?"

Diavolo : they still wanted to fight so we fought"

Barbatos : did you kill anyone?"

Diavolo : no. At least I don't think so I left them in front of the hospital they should be fine. Everything is fine"

Barbatos : good. Now go get clean up we don't need them knowing what you did. Unless you're both ready to them which your not"

Diavolo : alright....."

Little did they know Lucifer was watching them and heard what they said.