Is this something new from the OVAs or the manga? either way I'm complete lost here, but I do enjoy badass alucard with a sword

I remember there was a flashback in his fight against Incognito in the awful original anime. It was only for a couple of seconds on screen tho.

That's Alucard's true form. Vlad the Impaler

It shows on the OVA that when his final restriction is removed, he becomes Vlad and every person he drank from shows up as his own personal army.