Leo, accompanied by his menacing demonic serpent, pushed open the grand doors of the mansion and stepped into a scene of formidable fortification. The once-lavish entrance hall had transformed into a heavily guarded stronghold, with armed goons positioned strategically throughout the expansive space. Leo's eyes gleamed with a mix of anticipation and confidence, knowing that despite the odds stacked against him, his demonic serpent and his blood-control ability would be his greatest weapons as he prepared to engage in a battle that would determine the fate of the Don.