Based on

Movies like Transformers: Power of the Primes (2018)

In the aftermath of the Titans' conflict that concluded into Optimus Prime's death, the rest of the Transformers must stand together in order to stop Megatronus from wiping out their species forever. During their search for the Requiem Blaster, more mysteries about Cybertron’s past will be uncovered, and a new Prime will be chosen.