If Gabriel was sent to Hell
Samael(Lucifer) was a dreamer, and he loved to share his ideas. He also talked about free will. Many angels ignored him, but some angels, including Satanael who was the High Seraphim and good friend with Archangels, were interested in what he said.
Unfortunately, they decide to disobey God.
War breaks out. Friends of the archangels, including Satanael, were the leaders of the traitors.
Samael was not one of the traitors. He found Raphael, who didn't expect that to happen and was very scared, among the traitors. Raphael explain why he was there. Samael realized that he's had an impact on this happening, and he despaired.
In the end, the traitors, including Raphael, fell.
Archangels were saddened by the loss of their brother, their friends, and their lover(in Gabriel's case). Samael suffered from guilt, and Gabriel, Michael, and Uriel blamed him.
My country needs to import something from France
I wrote ineffable bureaucracy fic
The backchatting in 6000 years
+ A little crossover with Hazbin Hotel