nerfed

To bump lightly, whether accidentally or purposefully.

“A racer will often nerf another as a psychological tactic.”

To cripple or weaken an element of a video game during its development (such as a character, a weapon, a spell, etc.).

“The lightning spell was originally pretty powerful, but in the sequel they nerfed it so it became completely useless.”

To arbitrarily limit or reduce the capability of.

Crippled; made weak or worse.