The Kaled Mutant itself isn't that capable. It's strong enough to kill a human, and its hardwired to never ever die of old age. For individual Time War units: DOCTOR: Because I'm here. How did it get to Earth? Does anyone know? GODDARD: The records say it came from the sky like a meteorite. read more
'The loader's gravity field cancels out the Dalek's elevation units,' explained Scrum. read more
As Robert Pollock said, Daleks are not the strongest beings in the universe. Their polycarbide dalekanium armor is a very strong material, but has been penetrated numerous times. Without their force field protection, the armor has even been penetrated with normal strong explosives. read more