Here is the professional, grammatically flawless English translation of the provided text, preserving the original tone, atmosphere, emotional weight, rhythm, and stylistic nuances as closely as possible:
Larden looked at Zaber and began speaking in a calm, cold voice. There was neither pity nor softness in his tone — only the heavy, measured gravity that belongs to someone who has seen far too much.
"You are only five years old now, boy. Because of your character, I had thought you much older. At your age, thinking about building a clan, eternal power, and revenge is far too much. I will not refuse to mentor you, but this path will ultimately end in something horrific."
Zaber's brows furrowed. A spark of protest began to flash in his eyes.
"What do you mean by horrific ending, old man?" he asked.
Larden took one step forward. The ancient stones lying beneath the ground creaked and slowly crumbled under his feet.
