7 lights/star power each have power over one respective universe, which in transformers are infinite in size (idk how DB takes infinitely sized universes, im just explaining how it is in transformers). Megatron Omega takes a shot from a fully charged Silver Matrix cannon wielded by Primus and survives. Silver Matrix is capable of harnessing all 7 lights and previously fused the seven universes together into the Precursor World. Golden Megatron has two of them, from different points in the timeline, as well as Golden Power from The One. So he's solidly multiversal and bare minimum has universal durability waaaaay beyond the baseline, if not higher.