Upgrading Thundercracker required several key elements.
First was Vibranium ore. This time, Thundercracker's upgrade materials depended on it.
Second was the AllSpark. Besides providing the energy for Thundercracker's upgrade, the energy it emitted could also Cybertronize the Vibranium ore. In other words, it would grant the Vibranium ore the properties of Cybertronian metal while preserving its original characteristics, allowing it to integrate more effectively into Thundercracker's body and making his physical structure even stronger than alloyed Vibranium.
Third was the energy shielding chamber. This upgrade would require a considerable amount of the AllSpark's energy. To prevent others, whether human or Cybertronian, from detecting the AllSpark's energy, the energy shielding chamber was of paramount importance.
The reason Dilos had kept putting off Thundercracker's upgrade was that the energy shielding chamber had not been completed. On top of that, Dilos had been busy ever since. Now that all the conditions were in place, there was no excuse not to upgrade Thundercracker.
The route to the energy shielding chamber was rather long, yet Dilos and Thundercracker had to walk there. Mainly because...
"Your Majesty Dilos!"
Along both sides of the corridor, dozens of Cybertronians roughly ten meters tall put away their enormous drills, welding tools, and other construction equipment in the nearly packed passageway, then quickly lined up in two rows and bowed to Dilos in greeting.
"Pay us no mind. Continue with your work." Dilos swept his gaze over the Cybertronians, his calm voice carrying an unquestionable authority.
"Yes, Your Majesty!" With that, the Cybertronians resumed their work.
They had originally been Cybertronian protoforms stored aboard the Pioneer. After Dilos had preprogrammed them with various functions, the AllSpark had bestowed Sparks of life upon them, allowing them to take form.
In truth, these Cybertronians were still hatchlings. They had not been born