The goldfish's ability was rather innovative. It wasn't related to combat, but digestion. Its burst element ability was internally actuated.
In essence, it was a bit similar to the three-horned man's ability in that it was particle-related. But, the size of the burst element particles here reached the cellular level and even below.
And, they were produced within its stomach, allowing it to break down anything it consumed, literally, and break them into molecules. The burst element would then act as a catalyst to make the molecules react in desired ways to give rise to suitable products.
At first glance, this wouldn't seem to be a spectacular ability. But, here was the catch. The burst element was capable of breaking down any construct, whether living or non-living. Secondly, catalysing to create the desired product, that was the catch.
