If Vlad is too small to be NASB 2's final boss, there's a simple solution. Since he's a ghost, he could possess a giant character like maybe Jorgan Vonstrangle during the final battle. And once you defeat the possesed Jorgan, Vlad will come out of him and you'll have to defeat him before he repossesses Jorgan and revives him with full health, causing you to have to defeat Jorgan again to get Vlad to come back out, but the damage Vlad takes would always carry over to the next time you get him out of Jorgan's body and the sooner you beat Vlad, the sooner the fight will end. The only downside to this idea is that Jorgan would overshadow Vlad since he's a lot bigger, but Vlad would be controlling him.