It sounds like an ichneumon wasp

https://www.google.com/search?q=wasp+ich...

some are black

Yes, some of them are black in color.

Hey guys, today I saw something like a hornet in my house, It had a really long sting on its back but it wasnt black-yellow, It was just black.

The sting was extremely big, than any other hornet (If its a hornet)

Can you explain to me what actually is this?

Thanks