Board Thread:Fun and Games/@comment-30231428-20170319062148/@comment-26234016-20170327222825

Bismuth was originally a builder for Homeworld, assigned to help construct the colony on Earth. After encouragement from Rose, however, she fought in the Rebellion alongside the Crystal Gems. She made all of the material weapons used by the Crystal Gems during the Rebellion and even took part in the fighting herself.

At some point before the war ended, she created the Breaking Point and presented it to Rose, who disagreed with the weapon and Bismuth's intentions with it. Bismuth, in a rage, attacked Rose under the belief that Rose 'left her no choice' and was poofed by Rose, bubbled, and placed inside of Lion's Dimension. Rose then hides the truth from everyone, telling them that she had lost track of Bismuth at the Battle for the Ziggurat.

Approximately 5,300 years later, Steven frees her from the bubble by accident. After regenerating, she was confused where all of the other Crystal Gems were. Bismuth was brought to the Strawberry Battlefield where she learned how long she was inactive for and that she, Pearl, and Garnet are the only known survivors of the rebellion still around in the present day.

Bismuth then shows them the Forge and how she makes weapons. Later, Bismuth attempts to present the Breaking Point to Steven. When Steven rejects the weapon as Rose did, Bismuth attacks him in a rage as she had tried to his mother, forcing him to impale her on Rose's sword and poof her before destroying the Breaking Point.

Steven came back to the temple and told the Gems what really happened to Bismuth before and what happened to her now, after which they put her gem in the Burning Room with the Corrupted and Cluster Gems while mourning their fallen friend.

In "Mindful Education", it is revealed that Steven is still traumatized from the events of "Bismuth" and feels guilty for being unable to help her, along with Jasper and Ruby (Eyeball).