Level 80s can destroy cities

“Correct. Even the strongest Powered Suits could only have the offensive capabilities equivalent to level eighty characters. However, that hinges on my knowledge on the Powered Suits being perfect. Hypothetically, if there were rarer or Artifact grade Powered Suits, it would be a completely different situation. If that were the case, there could be Powered Suits much more powerful than the ones I have described.”
[...]
Ainz was journeying through his memories when he realized.
If Red Drop had a Powered Suit from Yggdrasil — the black sword of the leader of the other adamantite-ranked team, Blue Rose, could be of a similar power level.
According to the intel they had gathered from their aides in the capital, the weapon she wielded was said to be powerful enough to level an entire city.
Though that aide found the intel to be preposterous, it did originate from a member of the team itself.
Ainz always thought that she was either lying to her teammates, or just making things up.
But given what he knew now — perhaps, that intel was true.
He had heard that the leaders of Blue Rose and Red Drop were relatives.
If they were related, then having the same level of equipment should not be weird at all.

- Overlord; Vol 14; Chapter 2