Brutus by The Buttress inspired.

Immortality was nothing glamorous. Though you lived with no regret. Your heart grows cold at fickle human emotions.

Your beginning was wicked. You were the right hand to a man you so deeply admired, yet you hated.. envied. He was your Count. The world you revolved around for so long. What motivated you? Hatred? Was it love? There was love, yet the feeling of envy. It was a sick poison that consumed you. From birth, you we're like brothers of different mothers. Within the spirit of the same womb. One in the same. Yet not completely... The day he fell from power. At the hands of the church. To your benefit. You had betrayed your world for what felt right. What were you to say centuries later. He seemed the same yet so different, under the control of the Hellsing Organization. Deep down, your contribution had led him to where he was.

Alucard's laughter echoed through the empty air, low and cold, a sound that seemed to mock the very fabric of time. His eyes, gleaming with crimson light, bore into you as if peeling back every layer you had built to shield yourself. He took a step forward, the silence of his approach more unnerving than the noise. "Do you feel it now?" he asked, his voice a silken snarl. "That gnawing emptiness clawing at your chest? You called it justice then, didn’t you? Perhaps even righteousness. But deep down, you knew. Betrayal is the only truth you ever tasted, and it has left you hollow." He grinned wider, teeth flashing like a predator about to strike. "Centuries ago, you destroyed a king. Today, you stand before a god. So tell me—do you still feel right, or does regret weigh heavier than eternity?"