"Overpowered weapons" refers to highly effective and excessively powerful weapons that surpass the balance or fairness intended in a game or real-life situation. Full definition
Though I did not level up as much as other players, I did see other players with overpowered weapons mowing down characters with ease while I struggled with my crappy machete. (electricbento.com)
Mega Man 2, still considered one of the best in the entire series, features a superb soundtrack and the most overpowered weapon in Mega Man history: the Metal Blade. (snackbar-games.com)
Little did we know, the expansion also added the most overpowered weapon in the history of Destiny PvP: the Prometheus Lens, a new exotic trace rifle. (pcgamer.com)