I had this dream that I was playing a NSMB-type Mario game and this tougher level ended with a completely relentless fish with brown spikes that killed me. Then on the overworld, it said “YOU GOT KNIVES” and Mario got a fish suit. That enabled him to throw knives. Knives that pierced the fish’s spiky armor and killed it so I could keep going.
Knife-fish? Knifish?
Knife-throwing Fish Suit confirmed for Super Mario 3D World
Ooh! Ooh! Killifish!