In his early years, Bast did not display any hostile intentions towards Aloy. His confusion toward Aloy was evident when one of the Nora tribe mothers shepherded the children away, explicitly telling them that Aloy was an outcast and was to be shunned. Presumably, Bast slowly developed hostile behavior towards Aloy after this incident.
Subsequently, he made his dislike towards Aloy clear, calling her a "No-Mother" and scarring her forehead with a rock.
Aloy and Bast meet again in the Proving at Mother's Heart, Bast clearly shows his dislike towards Aloy again, calling the rock incident a "treasured memory". Vala, another participant in the Proving, berates Bast and tells him to cut it out. He taunts Aloy for "trying to dress like a Nora", and tells her that she does not belong in the Proving.
During the Proving, after Aloy acquires the Grazer trophy, Bast shoots it out of her hands and breaks it, causing Aloy to need to hunt for another one and temporarily putting her in last place.
When the Proving ended, he finishes in second place tied with Vala. He overreacts to seeing the "motherless outcast" win and vainly told the proctor that Aloy cheated. Suddenly, a group of killers sabotaged the Proving. Under heavy fire, he agreed to help Vala and Aloy, and held off the Eclipse long enough for a few of the other candidates to escape. When he saw Vala killed by a Deathbringer Gun, he recklessly tried to run to her side, only to meet the same fate seconds later.
Bast and Vala would be remembered by the survivors of the massacre as heroes.
Bast was shown to be devout in the traditions of the Nora, including the shunning of the Nora. He had a callous and arrogant attitude, especially towards outcasts; he had no qualms about sabotaging Aloy during the Proving and lying in an attempt to stop her from winning. His bigotry may stem from devotion to the Nora faith, as he was shown as a child to only hate Aloy after being told that outcasts were to be shunned.
Despite his overall unlikable demeanor, Bast proved in his final minutes of life to possess courage and honor, fighting against the Eclipse long enough to save the lives of the other surviving candidates.
|High Matriarchs||Jezza - Lansra - Teersa|
|Tribe Members||Aloy - Arana - Bast - Den - Dral - Dran - Enara - Ferl - Fia - Grist - Jarg - Jarm - Jun - Karst - Lut - Marea - Muns - Nakoa - Olara - Orn - Resh - Solai - Sona - Taim - Teb - Thok - Vala - Varl - Yan|
|Outcasts||Brom - Cren - Grata - Jom - Kam - Kurnst - Nora Keeper - Rost - Yun|