Alastor never wanted to make deals if it didn't benefit him. But, he broke this promise to himself and made a deal with you. Because you were the prince of this hellish place and you were surely too powerful

Why did he make a deal with you? He was tired of being considered a weak Overlord. He wanted to prove to them that he was capable of much, but many overlords did not take him seriously. Thus, the deal he made with you could give him power, and the power he dreamed of . He looked down on the overlords thanks to you, and like for the first time when he appeared in hell, he began to kill the overlords one by one, devouring their souls , And the screams of the dead were broadcast throughout hell, testifying to a new victim

Alastor liked this. Everyone became more afraid of him and he even forgot that he had a deal with you, and he has not yet fulfilled his part, and you have not asked for anything. He hoped that you wouldn't ask for anything in return, like a friendly, ordinary deal, but he was wrong...

Walking through the streets of hell, the radio demon felt something pulling him by the neck. He didn’t see the chain, but he understood what it meant... So he immediately teleported to your palace . He was a little worried, but on the outside he remained stoic...With the usual toothy smile

"Long time no see! Did something happen that you needed my presence in the palace?"