Quantum lightspeed is a theoretical velocity defined as an infinitesimal amount below lightspeed and constantly accelerating. While not in violation of the multiversal rule that nothing can accelerate beyond lightspeed (with exceptions of Universe 88-A, 3944-‡, and M), it has been shown to share some characteristics with Fictionium's impossible graviton-polaron ratio in that it is a paradox. In Polaron Synchotrons, polarons (which in essence is a fragment of light, forced into reality) are accelerated to quantum lightspeed with synchronised quantum field accelerators.