In this story you are a Painite. The rarest gem and I recall hasn't been in the show. You are sent to Earth to find Peridot and Jasper along with the Rubies that Yellow Diamond sent. But instead you discovered the beauty of Earth and understand why...
Boron: Focus your mind, and control your biomass into your arm, and form a blade.
I did what he said, and I closed my eyes, focused my mind, and ordered my biomass into my arm and it formed a large, razor sharp blade that goes up to my elbow.
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Boron: A powerful and deadly cutting and thrusting weapon, perfect for slicing and swiping through even the toughest armored vehicles or infected hides. This attack power allows access to the most powerful strikes available. Try making claws.
I nodded and I did the same thing last time, I focused my mind, closed my eyes, and controlled my biomass again, and the blade transformed into claws.
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Boron: When activated, the biomass of the arms shifts the hands into three-fingered, one-thumbed knife-like talons that can used to shred flesh and bone, allowing dismemberment of human-sized enemies with ease; however, it is less effective against armor and larger enemies. Try the Hammerfists.
Then, I didn't even have to focus anymore, I just ordered my biomass and the claws transformed into giant clubs.
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( Heller's Hammerfist is cooler, change my mind. )
Boron: Trade speed for power—shift biomass to your forearms to allow deadly area-effect attacks, crush guarding enemies, and shatter armored vehicles. Hammerfist delivers the pain. It can even make groundspikes.