What comes after the mantle?

Excuse me, but could you possibly elaborate on what comes after the mantle? I've been reading through this text and it seems to suggest a significant shift or transition, yet the details are rather vague. Could you please clarify the context in which the mantle is mentioned and what its successor might be? Is it a new era, a technological advancement, or perhaps a shift in power? I'm quite intrigued and would appreciate it if you could shed some light on this matter. Thank you in advance for your assistance.