The power of Dark Lord Serius

Aiden wake up and his head was felling dizzying. He hears a bell. He thinks am I dead. But no where am I. Then a maid said third master are wake up. Please have your tea. Aide asked who are you? Then Charles (butler) came and said young master are you alright. I should go and call a healer. Aiden said wait are you guys alive. Charles are you alive. He cried. Charles says young master what happened. Call a healer. Aiden said don't need that. Young master please give me permission to call. Aiden said stop Charles. Aiden asked which year is it? Charles replied young master this is year 487. Aiden wake up from bed and came in front of mirror and see he is 10 years and 11-month-old. Suddenly Aiden realize something and saw on his hand. Where a black eagle tattoo and it border it was violet color. Aiden notice his eyes' pupil are not brown it become red. Aiden asked Charles am I looking strange. Charles says young master no you are looking very well. Aiden think as I suspect. The timeline changed from my birth. Then Aiden fresh up and go to the garden. Aiden sit in a chamber and servants bring his tea. Then suddenly window pop-upped. Welcome to new word. You can ask me anything in your mind. Aiden asked am I reincarnate? System says yes. Why my eyes are weird and why I have a tattoo. As you are the incarnation of lord of darkness. The symbol and proof of your dark aura. I will tell you story. There are many being in this world. One of them are lords. You(pl) called them as God. There are the highest being. they can control as the want. There are many lords. Among them most powerful is Lord of darkness Sirus. Sirius posses' intense level of power and ability of necromancy soul summon and undead summon and also the many more. He connects you with his soul. You can use his power as you want. You know there is no curse no black magic and even no dark spell that is superior than Sirius's power. Also, you can use forbidden magic and dark spells that any lord or human can use. Even shadow magic. In simple word you got biggest jackpot in the Universe. You are 10 years 11 months 25 days old. After some days is your mana test. Be prepared to shine. You can use normal spells to because you have curse in your heart for that reason you can't cast magic. Because you are incarnation of serious that curse didn't work. Aiden asked seriously. System replied yes. Aiden says finally. Lord Sirius thank you to free me from that hell.